Multienergy Anomalous Diffuse Scattering

M. Kopecky, J. Fabry, J. Kub, A. Lausi, and E. Busetto
A new approach to local structure determination is presented. A three-dimensional region of the reciprocal space of a SrTiO single crystal was mapped by measuring x-ray diffuse scattering patterns at different sample orientations in order to reconstruct the local atomic structure. The phase problem ... [Phys. Rev. Lett. 100, 195504 (2008)] published Fri May 16, 2008.

Simultaneous measurement of electronic and vibrational dynamics to clarify a geometrical relaxation process in a conjugated polymer

Juan Du, Zhuan Wang, Wei Feng, Katsumi Yoshino, and Takayoshi Kobayashi
The real-time vibrational spectroscopy was utilized to obtain both electronic and vibrational dynamics in a conjugated polymer under the same excitation and probing condition by using the same sample and observing at the same time. Most of the conjugated polymers are in an amorphous phase, in which ... [Phys. Rev. B 77, 195205 (2008)] published Thu May 15, 2008.

Impurity segregation and ordering in Si/SiO[sub 2]/HfO[sub 2] structures

A. G. Marinopoulos, K. van Benthem, S. N. Rashkeev, S. J. Pennycook, and S. T. Pantelides
We use first-principles calculations and experimental data to demonstrate that impurity segregation at heterointerfaces is governed by several factors. In particular, Hf impurities avoid the Si-SiO interface when present in the SiO side, might segregate if present in the Si side, but do not cross in ... [Phys. Rev. B 77, 195317 (2008)] published Thu May 15, 2008.

Solid-state dewetting-mediated aggregation of nanoparticles

J. S. Palmer, P. Swaminathan, S. Babar, and J. H. Weaver
The deposition of Au onto thin Xe films at a low temperature leads to cluster formation. The subsequent Xe sublimation results in cluster aggregation and delivery to the substrate in a process known as buffer-layer-assisted growth. Previously, this process was described in terms of a diffusion-limit ... [Phys. Rev. B 77, 195422 (2008)] published Thu May 15, 2008.

Young's modulus of VO[sub 2] thin films as a function of temperature including insulator-to-metal transition regime

Nelson Sepulveda, Armando Rua, Rafmag Cabrera, and Felix Fernandez
Young's modulus of VO thin films has been measured for the first time through the material's insulator-to-metal transition. The resonant frequency of silicon VO coated cantilevers was measured in the temperature range 3090 degrees C. It has been found that during the semiconductor to metallic tran ... [Appl. Phys. Lett. 92, 191913 (2008)] published Thu May 15, 2008.

Cutoff effect of light transmission through structured metal films

Shi-qiang Liu, Qian-jin Wang, Xiao-gang Yin, Cheng-ping Huang, and Yong-yuan Zhu
The optical transmission spectra of structured metal films, which were fabricated by depositing a thin metal layer on the perforated metal surface, have been experimentally studied in this paper. They exhibit an extraordinary cutoff effect at certain wavelength, beyond which no efficient light trans ... [Appl. Phys. Lett. 92, 191914 (2008)] published Thu May 15, 2008.

Accelerating dislocations to transonic and supersonic speeds in anisotropic metals

Helio Tsuzuki, Paulo S. Branicio, and Jose Pedro Rino
The dynamics of stress-accelerated dislocations in copper is investigated using molecular dynamics simulations. The structure and motion of dissociated edge dislocations are analyzed using the common neighborhood parameter and local stresses. Dislocations are accelerated by high shear stresses and r ... [Appl. Phys. Lett. 92, 191909 (2008)] published Thu May 15, 2008.

Resonant Raman scattering probe of alloying effect in ZnMgO thin films

J. F. Kong, W. Z. Shen, Y. W. Zhang, C. Yang, and X. M. Li
We have presented a detailed resonant Raman scattering investigation for the alloying effect in hexagonal ZnMgO (x<=0.323) thin films grown by pulsed laser deposition. Alloy-induced longitudinal optical (LO) phonon resonance effect has been achieved from the Raman peak shift, lineshape, and intensit ... [Appl. Phys. Lett. 92, 191910 (2008)] published Thu May 15, 2008.

Scanning x-ray diffraction with 200 nm spatial resolution

M. Hanke, M. Dubslaff, M. Schmidbauer, T. Boeck, S. Schoder et al.
We report a scanning technique, which combines high resolution x-ray diffraction (in reciprocal space) along with a submicrometer spatial resolution (in real space). SiGe/Si(001) StranskiKrastanow islands served here as a well investigated model system to check the limits of the developed method. A ... [Appl. Phys. Lett. 92, 193109 (2008)] published Thu May 15, 2008.

Spectral dependence of the excited-state absorption of erbium in silica fiber within the 1.48--1.59 mu m range

A. D. Guzman-Chavez, Yu. O. Barmenkov, and A. V. Kir'yanov
We report the study of the excited-state absorption (ESA) spectrum of Er in erbium-doped silica fiber (EF) within the telecom band, 1.481.59 [mu]m. Two experimental techniques, the detection of up-conversion emission following the ESA process and the measurement of the EF nonlinear transmission coe ... [Appl. Phys. Lett. 92, 191111 (2008)] published Thu May 15, 2008.

Study on threading dislocations blocking mechanism of GaN/Al[sub x]Ga[sub 1 - x]N superlattices

L. W. Sang, Z. X. Qin, H. Fang, X. R. Zhou, Z. J. Yang et al.
GaN/AlGaN superlattices (SLs) with different period thicknesses t were grown as interlayers between GaN and AlGaN epilayers. The effect of threading dislocations (TDs) blocking became more evident with increasing t. Transmission electron microscopy analysis shows that TDs are inclined to be bended i ... [Appl. Phys. Lett. 92, 192112 (2008)] published Thu May 15, 2008.

Collisionless phenomena in heteronuclear clusters

J. Jha and M. Krishnamurthy
Argon K-shell x-ray yields and electron fluxes are measured for water doped Ar clusters as a function of laser pulse width. The high energy electron and x-ray yields are significantly enhanced in doped clusters. We show that doping of the clusters can be used to enhance collisionless absorption. ... [Appl. Phys. Lett. 92, 191108 (2008)] published Thu May 15, 2008.

Finite element analysis of a crack tip in silicate glass: No evidence for a plastic zone

T. Fett, G. Rizzi, D. Creek, S. Wagner, J. P. Guin et al.
Recently, the claim was made that cracks in silicate glasses propagate by the nucleation, growth, and coalescence of cavities at crack tips, which is the same way as in metals but at a much smaller scale. This hypothesis for crack growth is based in part on the measurement of surface displacements n ... [Phys. Rev. B 77, 174110 (2008)] published Thu May 15, 2008.

Adsorption of fluids in a pore with chemical heterogeneities: The cooperative effect

Zhikuan Feng, Xianren Zhang, and Wenchuan Wang
In this work, we study the cooperative adsorption of fluids in a heterogeneous pore, in which the pore walls are composed of homogeneous substrates with chemical groups (CGs) decorating them. The adsorption caused by the homogeneous substrates alone and that by CGs do not add up to the overall adsor ... [Phys. Rev. E 77, 051603 (2008)] published Thu May 15, 2008.

Anchoring of nematic liquid crystals on a thin polymeric film

A. L. Alexe-Ionescu, G. Barbero, and L. Komitov
We analyze the influence of a thin polymer layer with lateral side groups on the anchoring of a nematic liquid crystal. We show that the effective anisotropic part of the anchoring energy depends on the coupling of the nematic with the polymer side groups, as well as on the coupling of the polymer s ... [Phys. Rev. E 77, 051701 (2008)] published Thu May 15, 2008.

Phase separation of an asymmetric binary-fluid mixture confined in a nanoscopic slit pore: Molecular-dynamics simulations

Katarzyna Bucior, Leonid Yelash, and Kurt Binder
As a generic model system of an asymmetric binary-fluid mixture, hexadecane dissolved in carbon dioxide is considered, using a coarse-grained bead-spring model for the short polymer, and a simple spherical particle with Lennard-Jones interactions for the carbon dioxide molecules. In previous work, i ... [Phys. Rev. E 77, 051602 (2008)] published Thu May 15, 2008.

Defect-mediated emulsification in two dimensions

K. S. Korolev and David R. Nelson
We consider two-dimensional dispersions of droplets of isotropic phase in a liquid with an XY-like order parameter, tilt, nematic, and hexatic symmetries being included. Strong anchoring boundary conditions are assumed. Textures for a single droplet and a pair of droplets are calculated and a univer ... [Phys. Rev. E 77, 051702 (2008)] published Thu May 15, 2008.

Multicritical Nishimori point in the phase diagram of the [plus-minus]J Ising model on a square lattice

Martin Hasenbusch, Francesco Parisen Toldin, Andrea Pelissetto, and Ettore Vicari
We investigate the critical behavior of the random-bond J Ising model on a square lattice at the multicritical Nishimori point in the T-p phase diagram, where T is the temperature and p is the disorder parameter (p=1 corresponds to the pure Ising model). We perform a finite-size scaling analysis of ... [Phys. Rev. E 77, 051115 (2008)] published Thu May 15, 2008.

Stress orientation and relativistic effects on the separation of moving screw dislocations

Z. Q. Wang and I. J. Beyerlein
The subsonic motion of a fast-moving, extended screw dislocation in an fcc metal under constant stress is studied using continuum linear elastic dislocation theory and molecular dynamics (MD) simulation. In this regime, many phenomena predicted by the theory are shown to prevail in simulation, in pa ... [Phys. Rev. B 77, 184112 (2008)] published Thu May 15, 2008.

Electronic contributions to infrared spectra of adsorbate molecules on metal surfaces: Ethene on Cu(1 1 1)

O. Skibbe, M. Binder, A. Otto, and A. Pucci
Already at coverages well below 1 ML copper ad-atoms on Cu(1 1 1) significantly modify infrared reflection-absorption spectra of ethene (CH) on Cu(1 1 1). Raman modes of the centrosymmetric molecule appear in the spectra. Their lines do not involve significant shifts of vibration frequencies as they ... [J. Chem. Phys. 128, 194703 (2008)] published Thu May 15, 2008.

Subdiffusive dynamics of a liquid crystal in the isotropic phase

Luca De Gaetani, Giacomo Prampolini, and Alessandro Tani
The isotropic phase dynamics of a system of 4-n-hexyl-4-cyano-biphenyl (6CB) molecules has been studied by molecular dynamics computer simulations. We have explored the range of 275330 K keeping the system isotropic, although supercooled under its nematic transition temperature. The weak rototransl ... [J. Chem. Phys. 128, 194501 (2008)] published Thu May 15, 2008.

Coarse-grained lattice kinetic Monte Carlo simulation of systems of strongly interacting particles

Jianguo Dai, Warren D. Seider, and Talid Sinno
A general approach is presented for spatially coarse-graining lattice kinetic Monte Carlo (LKMC) simulations of systems containing strongly interacting particles. While previous work has relied on approximations that are valid in the limit of weak interactions, here we show that it is possible to co ... [J. Chem. Phys. 128, 194705 (2008)] published Thu May 15, 2008.

Impurities in LiFePO[sub 4] and Their Influence on Material Characteristics

Denis Y. W. Yu, Kazunori Donoue, Tetsuo Kadohata, Tetsuyuki Murata, Shigeki Matsuta et al.
LiPO impurity was found in hydrothermally grown LiFePO samples made with excess Li. The impurity dissociates in water, leading to an apparent alkaline nature of the LiFePO sample. The impurity can be removed by washing the sample in a neutral buffer solution, after which an increase in specific capa ... [J. Electrochem. Soc. 155, A526 (2008)] published Thu May 15, 2008.

Transmittance and transparency of subwavelength-perforated conducting films in the presence of a magnetic field

Yakov M. Strelniker and David J. Bergman
We theoretically and numerically studied the transmission of light through a subwavelength-perforated metal film, as well as through a homogeneous metal film with a Drude ac conductivity tensor, in the presence of a static magnetic field. Both the perforated and the homogeneous metal films are found ... [Phys. Rev. B 77, 205113 (2008)] published Thu May 15, 2008.

Analytical study of the plasmonic modes of a metal nanoparticle circular array

Kin Hung Fung and C. T. Chan
We analyze the plasmonic modes of a metal nanoparticle circular array. Closed-form solutions to the eigenmode problem are presented. For each polarization, the plasmonic mode with the highest quality is found to be in antiphase. The significant suppression of radiative loss can be understood as the ... [Phys. Rev. B 77, 205423 (2008)] published Thu May 15, 2008.

Nature and strength of bonding in a crystal of semiconducting nanotubes: van der Waals density functional calculations and analytical results

Jesper Kleis, Elsebeth Schroder, and Per Hyldgaard
The dispersive interaction between nanotubes is investigated through ab initio theory calculations and in an analytical approximation. A van der Waals density functional (vdW-DF) [M. Dion et al., Phys. Rev. Lett. 92, 246401 (2004)] is used to determine and compare the binding of a pair of nanotubes ... [Phys. Rev. B 77, 205422 (2008)] published Thu May 15, 2008.

Terahertz characterization of multi-walled carbon nanotube films

Ziran Wu, Lu Wang, Yitian Peng, Abram Young, Supapan Seraphin et al.
Multi-walled carbon nanotube films are characterized using terahertz time-domain spectroscopy. Both transmission and reflection experiments are performed in order to measure both the complex refractive index and the wave impedance. This method allows simultaneous extraction of both the permittivity ... [J. Appl. Phys. 103, 094324 (2008)] published Thu May 15, 2008.

IUPAC-NIST Solubility Data Series. 86. Ethers and Ketones with Water. Part 3. C[sub 7]--C[sub 14] Ethers with Water

Andrzej Maczynski, David G. Shaw, Marian Goral, and Barbara Wisniewska-Goclowska
The mutual solubilities and related liquid-liquid equilibria of nine binary systems of CC ethers with water are exhaustively and critically reviewed. Reports of experimental determination of solubility that appeared in the primary literature prior to the end of 2006 are compiled. For three systems, ... [J. Phys. Chem. Ref. Data 37, 1169 (2008)] published Thu May 15, 2008.

Scanning Superfluid-Turbulence Cascade by its Low-Temperature Cutoff

Evgeny Kozik and Boris Svistunov
On the basis of a recently proposed scenario of the transformation of the Kolmogorov cascade into the Kelvin-wave cascade, we develop a theory of low-temperature cutoff. The theory predicts a specific behavior of the quantized vortex line density, L, controlled by the frictional coefficient, alpha(T ... [Phys. Rev. Lett. 100, 195302 (2008)] published Thu May 15, 2008.

Subcritical Crack Growth: The Microscopic Origin of Paris' Law

Andre P. Vieira, Jose S. Andrade, Jr., and Hans J. Herrmann
We investigate the origin of Paris' law, which states that the velocity of a crack at subcritical load grows like a power law, da/dt~(DeltaK), where DeltaK is the stress-intensity-factor amplitude. Starting from a damage-accumulation function proportional to (Deltasigma), Deltasigma being the stress ... [Phys. Rev. Lett. 100, 195503 (2008)] published Thu May 15, 2008.

Thermodynamic Evidence for Nanoscale Bose-Einstein Condensation in [sup 4]He Confined in Nanoporous Media

Keiichi Yamamoto, Yoshiyuki Shibayama, and Keiya Shirahama
We report the measurements of the heat capacity of He confined in nanoporous Gelsil glass that has nanopores of 2.5-nm diameter at pressures up to 5.3 MPa. The heat capacity has a broad peak at a temperature much higher than the superfluid transition temperature obtained using the torsional oscillat ... [Phys. Rev. Lett. 100, 195301 (2008)] published Thu May 15, 2008.

Bent graphite surfaces as guides for cluster diffusion and anisotropic growth

M. Schmidt, N. Kebaili, A. Lando, S. Benrezzak, L. Baraton et al.
The interaction between neutral silver clusters and graphite surfaces is studied by cluster deposition and aggregation experiments. It is shown that the cluster diffusion is strongly influenced by the surface curvature. Convexly bent areas act as repulsive barriers for the cluster diffusion. Bent ar ... [Phys. Rev. B 77, 205420 (2008)] published Wed May 14, 2008.

Critical dopant concentration in polyacetylene and phase diagram from a continuous four-Fermi model

Heron Caldas, Jean-Loic Kneur, Marcus Benghi Pinto, and Rudnei O. Ramos
The optimized perturbation theory (OPT) method, at finite temperature and finite chemical potential, is applied to the field theory model for polyacetylene. The critical dopant concentration in trans-polyacetylene is evaluated and compared to available experimental data and to previous calculations. ... [Phys. Rev. B 77, 205109 (2008)] published Wed May 14, 2008.

X-ray absorption and x-ray magnetic dichroism study on Ca[sub 3]CoRhO[sub 6] and Ca[sub 3]FeRhO[sub 6]

T. Burnus, Z. Hu, Hua Wu, J. C. Cezar, S. Niitaka et al.
By using x-ray absorption spectroscopy at the Rh L, Co L, and Fe L edges, we find a valence state of Co/Rh in CaCoRhO and of Fe/Rh in CaFeRhO. X-ray magnetic circular dichroism spectroscopy at the Co L edge of CaCoRhO reveals a giant orbital moment of about 1.7[mu], which can be attributed to the oc ... [Phys. Rev. B 77, 205111 (2008)] published Wed May 14, 2008.

Publisher's Note: Thermodynamic states and phase diagrams for bulk-incoherent, bulk-coherent, and epitaxially-coherent semiconductor alloys: Application to cubic (Ga,In)N [Phys. Rev. B [bold 77], 205201 (2008)]

Jefferson Z. Liu and Alex Zunger
... [Phys. Rev. B 77, 209902 (2008)] published Wed May 14, 2008.

Optical excitation of nuclear spin coherence in a Tm[sup 3+]:YAG crystal

A. Louchet, Y. Le Du, F. Bretenaker, T. Chaneliere, F. Goldfarb et al.
A thulium-doped crystal is experimentally shown to be an excellent candidate for broadband quantum storage in a solid-state medium. The nuclear spin coherence is optically excited, detected, and characterized in such a crystal. The lifetime of the spin coherencethe potential storage entityis measure ... [Phys. Rev. B 77, 195110 (2008)] published Wed May 14, 2008.

Density-functional investigation of metal-silicon cage clusters MSi[sub n] (M = Sc, Ti, V, Cr, Mn, Fe, Co, Ni, Cu, Zn; n = 8--16)

Ling-ju Guo, Gao-feng Zhao, Yu-zong Gu, Xia Liu, and Zhi Zeng
The geometries, stabilities, electronic, and magnetic properties of the transition metal encapsulated MSi (M=Sc, Ti, V, Cr, Mn, Fe, Co, Ni, Cu, Zn; n=816) clusters have been systematically investigated by using density functional theory with generalized gradient approximation. It is shown that every ... [Phys. Rev. B 77, 195417 (2008)] published Wed May 14, 2008.

Comparison between experimental surface data and bulk structure models for quasicrystalline AlPdMn: Average atomic densities and chemical compositions

Baris Unal, C. J. Jenks, and P. A. Thiel
We have examined bulk structure models for icosahedral AlPdMn in terms of the densities, compositions, and interplanar spacings for the fivefold planes that might represent physical surface terminations. We focus on four models that contain no partial or mixed occupancies, but some comparison is mad ... [Phys. Rev. B 77, 195419 (2008)] published Wed May 14, 2008.

Highly efficient spatiotemporal coherent control in nanoplasmonics on a nanometer-femtosecond scale by time reversal

Xiangting Li and Mark I. Stockman
One of the main problems in nanoplasmonics is the active dynamic control of optical local fields. We propose an efficient method to solve this problem. It allows one to impose coherent control of the spatiotemporal localization of the optical excitation energy in nanoplasmonic systems on the nanomet ... [Phys. Rev. B 77, 195109 (2008)] published Wed May 14, 2008.

Nonradiative exciton energy transfer in hybrid organic-inorganic heterostructures

S. Chanyawadee, P. G. Lagoudakis, R. T. Harley, D. G. Lidzey, and M. Henini
Nonradiative energy transfer from a GaAs quantum well to a thin overlayer of an infrared organic semiconductor dye is unambiguously demonstrated. The dynamics of exciton transfer are studied in the time domain by using pump-probe spectroscopy at the donor site and fluorescence spectroscopy at the ac ... [Phys. Rev. B 77, 193402 (2008)] published Wed May 14, 2008.

Study of Ba and Zr stability in UO[sub 2 [plus-minus] x] by density functional calculations

G. Brillant and A. Pasturel
Barium and zirconium behavior in nuclear fuels is investigated using density functional theory (DFT). More particularly, incorporation and solution energies of Ba and Zr in preexisting trap sites of UO (vacancies, interstitials, U-O divacancy, and Schottky trio defects) are calculated using the proj ... [Phys. Rev. B 77, 184110 (2008)] published Wed May 14, 2008.

Adaptive nonlocal quasicontinuum for deformations of curved crystalline structures

Jong Youn Park and Seyoung Im
This paper presents an adaptive multiscale simulation of deformations of curved crystalline structures such as carbon nanotubes (CNTs). It is based on quasicontinuum approach, which is a coarse-graining method. For fully nonlocal quasicontinuum, high-order interpolation functions are adopted to loca ... [Phys. Rev. B 77, 184109 (2008)] published Wed May 14, 2008.

Statistical approach to dislocation dynamics: From dislocation correlations to a multiple-slip continuum theory of plasticity

Surachate Limkumnerd and Erik Van der Giessen
Due to recent successes of a statistical-based nonlocal continuum crystal plasticity theory for single-glide in explaining various aspects such as dislocation patterning and size-dependent plasticity, several attempts have been made to extend the theory to describe crystals with multiple-slip system ... [Phys. Rev. B 77, 184111 (2008)] published Wed May 14, 2008.

First principles study of Ge/Si exchange mechanisms at the Si(001) surface

F. Zipoli, S. Cereda, M. Ceriotti, M. Bernasconi, Leo Miglio et al.
Based on density functional theory calculations, we show that an isolated Ge adatom on Si(001) triggers an exchange mechanism involving three atoms, which leads to the formation of a Si adatom and a mixed SiGe surface dimer. The activation energy calculated from first principles is sufficiently low ... [Appl. Phys. Lett. 92, 191908 (2008)] published Wed May 14, 2008.

Understanding of transmission in the range of high-order photonic bands in thin opal film

S. G. Romanov, M. Bardosova, I. M. Povey, M. E. Pemble, and C. M. Sotomayor Torres
Diffraction in the face centered cubic lattice cannot explain some minima observed in the transmission spectra of self-assembled opal films. Here, we compared them with minima observed in the transmission spectra of a hexagonal close packed monolayer of spheres of the same diameter. The identity of ... [Appl. Phys. Lett. 92, 191106 (2008)] published Wed May 14, 2008.

Coordination defects in bismuth-modified arsenic selenide glasses: High-resolution x-ray photoelectron spectroscopy measurements

Roman Golovchak, Oleh Shpotyuk, Andriy Kovalskiy, Alfred C. Miller, Jiri Cech et al.
The possibility of coordination defects formation in Bi-modified chalcogenide glasses is examined by high-resolution x-ray photoelectron spectroscopy. The results provide evidence for the formation of positively charged fourfold coordinated defects on As and Bi sites in glasses with low Bi concentra ... [Phys. Rev. B 77, 172201 (2008)] published Wed May 14, 2008.

Thermodynamically consistent integral equation for soft repulsive spheres

Mauricio D. Carbajal-Tinoco
We present a new closure relation that is an extension of the thermodynamically consistent approximation of Rogers and Young [Phys. Rev. A 30, 999 (1984)]. In the proposed closure, we introduce a nonlinear term along with an additional thermodynamic consistency equation. We compare some thermodynami ... [J. Chem. Phys. 128, 184507 (2008)] published Wed May 14, 2008.

Gibbs ensemble Monte Carlo simulation of adsorption for model surfactant solution in confined slit pores

Lili Liu, Xiaoning Yang, and Zhijun Xu
An isobaric-isothermal Gibbs ensemble Monte Carlo simulation has been carried out to study the adsorption of a model surfactant/solvent mixture in slit nanopores. The adsorption isotherms, the density distributions, and the configuration snapshots were simulated to illustrate the adsorption and self ... [J. Chem. Phys. 128, 184712 (2008)] published Wed May 14, 2008.

Complex-time velocity autocorrelation functions for Lennard-Jones fluids with quantum pair-product propagators

Jeb Kegerreis, Akira Nakayama, and Nancy Makri
We use the pair-product approximation to the complex-time quantum mechanical propagator to obtain accurate quantum mechanical results for the symmetrized velocity autocorrelation function of a Lennard-Jones fluid at two points on the thermodynamic phase diagram. A variety of tests are performed to d ... [J. Chem. Phys. 128, 184509 (2008)] published Wed May 14, 2008.

Theory of resonance energy transfer involving nanocrystals: The role of high multipoles

Roi Baer and Eran Rabani
A theory for the fluorescence resonance energy transfer (FRET) between a pair of semiconducting nanocrystal quantum dots is developed. Two types of donor-acceptor couplings for the FRET rate are described: dipole-dipole (d-d) and the dipole-quadrupole (d-q) couplings. The theory builds on a simple e ... [J. Chem. Phys. 128, 184710 (2008)] published Wed May 14, 2008.

Density functional theory of inhomogeneous liquids. II. A fundamental measure approach

James F. Lutsko
Previously, it has been shown that the direct correlation function for a LennardJones fluid could be modeled by a sum of that for hard-spheres, a mean-field tail, and a simple linear correction in the core region constructed so as to reproduce the (known) bulk equation of state of the fluid [Lutsko, ... [J. Chem. Phys. 128, 184711 (2008)] published Wed May 14, 2008.

Ab initio based polarizable force field parametrization

Marco Masia
Experimental and simulation studies of anion-water systems have pointed out the importance of molecular polarization for many phenomena ranging from hydrogen-bond dynamics to water interfaces structure. The study of such systems at molecular level is usually made with classical molecular dynamics si ... [J. Chem. Phys. 128, 184107 (2008)] published Wed May 14, 2008.

To the kinetics of photoinduced volume changes in chalcogenide glasses

Rozalia Lukacs, Sergej D. Baranovskii, Peter Thomas, and Florian Gebhard
Recent experimental data on the dynamics of photoinduced volume changes in chalcogenide glasses are analyzed within a simple phenomenological model. Both kinetics of the volume expansion under continuous irradiation and that of the relaxation after the illumination is switched off are considered. Co ... [J. Appl. Phys. 103, 093541 (2008)] published Wed May 14, 2008.

Femtosecond laser and swift-ion damage in lithium niobate: A comparative analysis

A. Garcia-Navarro, F. Agullo-Lopez, J. Olivares, J. Lamela, and F. Jaque
Relevant damage features associated with femtosecond pulse laser and swift-ion irradiations on LiNbO crystals are comparatively discussed. Experiments described in this paper include irradiations with repetitive femtosecond-laser pulses (800 nm, 130 fs) and irradiation with O, F, Si, and Cl ions at ... [J. Appl. Phys. 103, 093540 (2008)] published Wed May 14, 2008.

High-pressure Raman scattering study on zircon- to scheelite-type structural phase transitions of RCrO[sub 4]

Y. W. Long, L. X. Yang, Y. Yu, F. Y. Li, Y. X. Lu et al.
High-pressure Raman scattering experiments were performed on the zircon-type RCrO (R=Nd, Dy) compounds with the space group I4/amd by using diamond anvil cell techniques at room temperature. These two compounds exhibit similar Raman behaviors. Pressure-induced structural phase transitions were obser ... [J. Appl. Phys. 103, 093542 (2008)] published Wed May 14, 2008.

Deformation potentials of the direct band gap of n-Al[sub 0.25]Ga[sub 0.75]As from controlled microscopic stress fields

Alessandro Alan Porporati, Naohide Furukawa, Wenliang Zhu, and Giuseppe Pezzotti
The deformation potentials have been experimentally determined for the direct gap of n-AlGaAs and compared to experimental and theoretical literature values. Highly localized spectroscopic stress assessments could be achieved using a field-emission electron gun as the energy source for stimulating c ... [J. Appl. Phys. 103, 096109 (2008)] published Wed May 14, 2008.

Electro-optical effect in films of azobenzene polycomplexes with cobalt

N. A. Davidenko, I. I. Davidenko, I. A. Savchenko, A. N. Popenaka, and L. B. Baath
Polymeric films containing azobenzene fragments with donor and acceptor groups were produced as well as films of polycomplexes of these fragments with cobalt. Absorption spectra of these films before and during application of an external electric field were investigated. Electro-optical properties o ... [J. Appl. Phys. 103, 094323 (2008)] published Wed May 14, 2008.

Jumps Across an Outgoing Spherical Shock Wave Front

Yukio Sano and Tomokazu Sano
The shock jump conditions have been used since Rankine published in 1870 and Hugoniot in 1889. However, these conditions, in which the geometrical effect is never included, may not be correctly applied to material responses caused by a spherical wave front. Here, a geometrical effect on jumps in rad ... [J. Appl. Mech. 75, 041017 (2008)] published Wed May 14, 2008.

Electron attachment to atomic hydrogen on the surface of liquid [sup 4]He

T. Arai, H. Yayama, and K. Kono
We demonstrate a possibility that helium surface electrons at cryogenic temperatures can be used as a new source of very low energy electrons. Since both electrons (e) and hydrogen atoms (H) are bound on liquid helium surface, two-dimensional mixture gas of these two species is available on the surf ... [Low Temp. Phys. 34, 397 (2008)] published Wed May 14, 2008.

Dip-effect in the conductivity of 2D electrons on a helium film with a rough substrate

P. Leiderer, S. Nazin, and V. Shikin
The phenomenon generally referred to as the dip-effect in the conductivity of 2D electrons on a helium film with a rough substrate is discussed. The particular case where this effect arises with the motion of 2D electrons along a helium film on a periodically corrugated substrate is examined. Argume ... [Low Temp. Phys. 34, 392 (2008)] published Wed May 14, 2008.

Dynamical structure factor of two-dimensional electrons over a helium film

P. C. Venturini, N. Studart, and J. P. Rino
The dynamical structure factor of a two-dimensional electrons trapped to a helium film deposited on a solid substrate is determined through molecular dynamics simulations for different film thicknesses and two substrates. The phases of the system varying from the classical Wigner crystal to strong a ... [Low Temp. Phys. 34, 388 (2008)] published Wed May 14, 2008.

Photoresonance and conductivity of surface electrons on liquid [sup 3]He

D. Konstantinov, K. Kono, and Y. Monarkha
Resonance variations of the in-plane conductivity of surface electrons (SEs) over liquid He induced by microwave (MW) radiation of a fixed frequency are experimentally and theoretically studied for low temperature scattering regimes (T<0.5 K). The system was tuned to resonance by varying the amplit ... [Low Temp. Phys. 34, 377 (2008)] published Wed May 14, 2008.

Diatomic model of a quantum crystal

Yu. M. Poluektov
The anharmonic zero-point vibrations of a crystal are studied using a two-atom model. It is shown that the amplitude of such vibrations cannot exceed a certain limiting value, which is a fraction of the interatomic distance. Compressing the crystal decreases and stretching increases the amplitude of ... [Low Temp. Phys. 34, 368 (2008)] published Wed May 14, 2008.

Bose--Einstein condensation in a decorated lattice: an application to the problem of supersolid He

D. V. Fil and S. I. Shevchenko
The BoseEinstein condensation of vacancies in a three-dimensional decorated lattice is considered. The model describes possible scenario of superfluidity of solid helium, caused by the presence of zero-point vacancies in a dislocation network. It is shown that the temperature of BoseEinstein condens ... [Low Temp. Phys. 34, 351 (2008)] published Wed May 14, 2008.

Formation of a glass phase in solid [sup 4]He. Contribution to the pressure in the supersolid region

V. N. Grigor'ev, V. A. Maidanov, V. Yu. Rubanskii, S. P. Rubets, E. Ya. Rudavskii et al.
High-precision barometry is used to perform measurements of the temperature dependence of the pressure of helium crystals, located in a constant volume, in the temperature range 50800 mK on crystals of different quality ranging from freshly prepared to carefully annealed. It is found that an additi ... [Low Temp. Phys. 34, 344 (2008)] published Wed May 14, 2008.

Defects and supersolidity: effects of annealing and stress on elastic behavior of solid [sup 4]He

A. Syshchenko, J. Day, and J. Beamish
Recent measurements have shown that solid He can decouple from a torsional oscillator below 200 mK, and defects appear to be crucial to this behavior. Helium's shear modulus increases in the same range, which can be understood in terms of dislocations pinned by He impurities at the lowest temperatu ... [Low Temp. Phys. 34, 340 (2008)] published Wed May 14, 2008.

Search for fourth sound propagation in supersolid [sup 4]He

Y. Aoki, H. Kojima, and X. Lin
A systematic study is carried out to search for fourth sound propagation solid He samples below 500 mK down to 40 mK between 25 and 56 bar using the techniques of heat pulse generator and titanium superconducting transition edge bolometer. If solid He is endowed with superfluidity below 200 mK, ... [Low Temp. Phys. 34, 329 (2008)] published Wed May 14, 2008.

``Infrared'' singularities in the field theory of superfluidity and temperature corrections to the first and second sound velocities in helium II

E. A. Pashitskii, S. I. Vilchinskii, and A. V. Chumachenko
Higher-order corrections to the self-energy parts of the field theory of superfluidity are obtained using V. N. Popov's perturbation theory modified for a strongly interacting Bose system and free of infrared divergences. It is shown that the calculation of these corrections reduces to solving kinet ... [Low Temp. Phys. 34, 320 (2008)] published Wed May 14, 2008.

Neutron reflection from a liquid helium surface

T. R. Charlton, R. M. Dalgliesh, O. Kirichek, S. Langridge, A. Ganshin et al.
The reflection of neutrons from a helium surface is observed for the first time. The He surface is smoother in the superfluid state at 1.54 K than in the case of the normal liquid at 2.3 K. In the superfluid state we also observe a surface layer ~200 A thick which has a subtly different neutron s ... [Low Temp. Phys. 34, 316 (2008)] published Wed May 14, 2008.

Konstantinov effect in helium II

L. A. Melnikovsky
The reflection of first and second sound waves by a rigid flat wall in helium II is considered. A nontrivial dependence of the reflection coefficients on the angle of incidence is obtained. Sound conversion is predicted at oblique incidence. ... [Low Temp. Phys. 34, 312 (2008)] published Wed May 14, 2008.

Bubble nucleation in a superfluid [sup 3]He--[sup 4]He mixture induced by acoustic wave

H. Abe, Y. Saitoh, T. Ueda, R. Nomura, Y. Okuda et al.
The nucleation dynamics of bubbles induced by an acoustic wave pulse in HeHe liquid mixtures is reported. The experiment is performed mixtures with fixed He concentrations of about 4% and 25% and for pure superfluid He. When a pulse of 1 ms duration is applied to the mixture at the saturated vapor ... [Low Temp. Phys. 34, 308 (2008)] published Wed May 14, 2008.

On cavitation in liquid helium in a flow due to a vibrating quartz fork

M. Blazkova, D. Schmoranzer, and L. Skrbek
Cavitation in normal and superfluid liquid He at saturated vapor pressure and slightly elevated pressures has been experimentally studied in a flow due to quartz forks vibrating at high amplitudes. Above the temperature- and pressure-dependent critical velocity, heterogeneous cavitation is observed ... [Low Temp. Phys. 34, 298 (2008)] published Wed May 14, 2008.

Energy spectrum of the velocity field induced by a fractal vortex line in superfluid helium

S. K. Nemirovskii and V. A. Andryushchenko
A Gaussian model of a vortex tangle is used to calculate the energy spectrum E(k) of a three-dimensional random velocity field induced by chaotic vortex lines. It is proposed that the lines have a random-walk structure (Brownian line) with different Hausdorff dimension H. It is shown that for a frac ... [Low Temp. Phys. 34, 293 (2008)] published Wed May 14, 2008.

Observation of acoustic turbulence in a system of nonlinear second sound waves in superfluid [sup 4]He

A. N. Ganshin, P. V. E. McClintock, V. B. Efimov, G. V. Kolmakov, and L. P. Mezhov-Deglin
The results of recent studies of acoustic turbulence in a system of nonlinear second sound waves in a high-quality resonator filled with superfluid He are discussed. It is found that when the driving amplitude is increased sufficiently, a steady-state direct wave cascade, involving a flux of energy ... [Low Temp. Phys. 34, 288 (2008)] published Wed May 14, 2008.

Collective modes in superfluid helium when there is a relative velocity between the normal and superfluid components

I. N. Adamenko, K. E. Nemchenko, V. A. Slipko, and A. F. G. Wyatt
Collective modes are studied in superfluid helium when the normal and superfluid components have a relative velocity w. In this paper the general dispersion relation for first and second sound modes is obtained for arbitrary values of w, and we have found the relationship between the amplitudes of t ... [Low Temp. Phys. 34, 279 (2008)] published Wed May 14, 2008.

Superfluidity of [sup 4]He confined in nanoporous media

K. Shirahama, K. Yamamoto, and Y. Shibayama
We have examined superfluid properties of He confined to a nanoporous Gelsil glass that has nanopores 2.5 nm in diameter. The pressure-temperature phase diagram was determined by torsional oscillator, heat capacity, and pressure studies. The superfluid transition temperature T approaches zero at 3. ... [Low Temp. Phys. 34, 273 (2008)] published Wed May 14, 2008.

On the possible nature of the electric activity of He II

V. M. Loktev and M. D. Tomchenko
An attempt is made to explain the nature of the electric signals observed in helium II in a second-sound standing wave. It is shown on the basis of the general principles of quantum mechanics that as a result of interatomic interactions each helium atom acquires a small induced dipole moment d, whic ... [Low Temp. Phys. 34, 262 (2008)] published Wed May 14, 2008.

Interaction of microwaves with superfluid flow in He II

A. S. Rybalko, S. P. Rubets, E. Ya. Rudavskii, V. A. Tikhii, R. Golovashchenko et al.
The absorption of 40200 GHz electromagnetic waves in liquid helium at temperatures 1.42.8 K is investigated experimentally. The spectrum of oscillations of the whispering gallery modes of a dielectric disk-shaped resonator immersed in liquid helium is recorded. Superfluid flows in He II is produc ... [Low Temp. Phys. 34, 254 (2008)] published Wed May 14, 2008.

Quantum-limited mass flow of liquid [sup 3]He

G. Lambert, G. Gervais, and W. J. Mullin
We consider theoretically the possibility of observing unusual quantum fluid behavior in liquid He and solutions of He in He systems confined to nanochannels. In the case of pure ballistic flow at very low temperature the conductance will be quantized in units of 2m/h. We show that these steps shoul ... [Low Temp. Phys. 34, 249 (2008)] published Wed May 14, 2008.

Reduced Carbon Solubility in Fe Nanoclusters and Implications for the Growth of Single-Walled Carbon Nanotubes

A. R. Harutyunyan, N. Awasthi, A. Jiang, W. Setyawan, E. Mora et al.
Fe nanoclusters are becoming the standard catalysts for growing single-walled carbon nanotubes via chemical vapor decomposition. Contrary to the Gibbs-Thompson model, we find that the reduction of the catalyst size requires an increase of the minimum temperature necessary for the growth. We address ... [Phys. Rev. Lett. 100, 195502 (2008)] published Wed May 14, 2008.

Thin-Thick Coexistence Behavior of 8CB Liquid Crystalline Films on Silicon

R. Garcia, E. Subashi, and M. Fukuto
The wetting behavior of thin films of 4-n-octyl-4-cyanobiphenyl (8CB) on Si is investigated via optical and x-ray reflectivity measurement. An experimental phase diagram is obtained showing a broad thick-thin coexistence region spanning the bulk isotropic-to-nematic (T) and the nematic-to-smectic-A ... [Phys. Rev. Lett. 100, 197801 (2008)] published Wed May 14, 2008.

Controlling Surface Defect Valence in Colloids

G. SkaCej and C. Zannoni
We perform large-scale Monte Carlo simulations of orientational ordering in nematic shells and study the type and position of topological defects when an external electric field (homogeneous or quadrupolar) is applied. The field-induced variation of the defect number (and strength) can be used to ch ... [Phys. Rev. Lett. 100, 197802 (2008)] published Wed May 14, 2008.

Nonradiative Quenching of Fluorescence in a Semiconducting Carbon Nanotube: A Time-Domain Ab Initio Study

Bradley F. Habenicht and Oleg V. Prezhdo
As shown experimentally, strong nonradiative decay channels exist in carbon nanotubes (CNT) and are responsible for low fluorescence yields. The decay of the electronic excitation to its ground state is simulated in the (6,4) semiconducting CNT with surface hopping in the Kohn-Sham representation, p ... [Phys. Rev. Lett. 100, 197402 (2008)] published Wed May 14, 2008.

IUPAC-NIST Solubility Data Series. 86. Ethers and Ketones with Water. Part 2. C[sub 6] Ethers with Water

Andrzej Maczynski, David G. Shaw, Marian Goral, and Barbara Wisniewska-Goclowska
The mutual solubilities and related liquid-liquid equilibria of C ethers with water are exhaustively and critically reviewed. Reports of experimental determination of solubility in binary systems that appeared in the primary literature prior to the end of 2006 are compiled. For four of the seven sys ... [J. Phys. Chem. Ref. Data 37, 1147 (2008)] published Wed May 14, 2008.

Indistinguishable photons from a diode

A. J. Bennett, R. B. Patel, A. J. Shields, K. Cooper, P. Atkinson et al.
We generate indistinguishable photons from a semiconductor diode containing an InGaAs/GaAs quantum dot. By using an all-electrical technique to populate and control a single-photon emitting state, we filter out dephasing by Stark shifting the emission energy on time scales below the dephasing time o ... [Appl. Phys. Lett. 92, 193503 (2008)] published Tue May 13, 2008.

Magnetic control of negative permeability metamaterials based on liquid crystals

Fuli Zhang, Qian Zhao, Lei Kang, Davy P. Gaillot, Xiaopeng Zhao et al.
We report on the tunability, by a magnetic field, of a negative permeability metamaterial consisting of stacked arrays of broadside-coupled split ring resonators infiltrated with liquid crystals (LCs). The resonant frequency shift was numerically assessed by a rigorous anisotropic analysis of the re ... [Appl. Phys. Lett. 92, 193104 (2008)] published Tue May 13, 2008.

Transmission and reflection of phonons and rotons at the superfluid helium-solid interface

I. N. Adamenko, K. E. Nemchenko, and I. V. Tanatarov
We solve the problem of the transmission and reflection of phonons and rotons at the interface between superfluid helium and a solid for all angles of incidence and in both directions. A consistent solution of the problem is presented, which allows us to rigorously describe the simultaneous creation ... [Phys. Rev. B 77, 174510 (2008)] published Tue May 13, 2008.

Isostructural transitions in bcc Zr induced by the peculiarities of the lattice dynamics under pressure

V. Yu. Trubitsin and E. B. Dolgusheva
The peculiarities of the atomic displacements corresponding to the longitudinal and transverse vibrations with wave vector k=(2/3)[111] in bcc zirconium are considered. It is shown that the three parts, which substantially differ in the lattice dynamics character, can be separated out in the region ... [Phys. Rev. B 77, 172302 (2008)] published Tue May 13, 2008.

Size-dependent modifications of the first-order Raman spectra of nanostructured rutile TiO[sub 2]

Varghese Swamy
The crystallite-size-dependent Raman spectral modifications observed for a suite of rutile TiO nanocrystals are analyzed and compared to the characteristics of the Raman spectra that were reported for nanoscale rutile TiO domains/crystallites embedded in thin films. The strong E and A modes display ... [Phys. Rev. B 77, 195414 (2008)] published Tue May 13, 2008.

Path-integral ground-state Monte Carlo study of two-dimensional solid [sup 4]He

E. Vitali, M. Rossi, F. Tramonto, D. E. Galli, and L. Reatto
We have studied a two-dimensional (2D) triangular commensurate crystal of He with the exact T=0 K path-integral ground-state (PIGS) Monte Carlo method. We have projected onto the true ground state two qualitatively different wave functions, a Jastrow-Nosanow wave function and a translationally inva ... [Phys. Rev. B 77, 180505 (2008)] published Tue May 13, 2008.

Out-of-plane magnetic domain structure in a thin film of La[sub 0.67]Sr[sub 0.33]MnO[sub 3] on SrTiO[sub 3] (001) observed by magnetic force microscopy

E. P. Houwman, G. Maris, G. M. De Luca, N. Niermann, G. Rijnders et al.
The room temperature out-of-plane magnetization of epitaxial thin films of LaSrMnO on SrTiO (001) has been investigated with magnetic force microscopy, using magnetic tips with very small coercivity, relative to the film. A clear magnetic pattern in the form of a checkerboard, with domain dimensions ... [Phys. Rev. B 77, 184412 (2008)] published Tue May 13, 2008.

Molecular dynamics investigation of dynamical heterogeneity and local structure in the supercooled liquid and glass states of Al

Maozhi Li, Cai-Zhuang Wang, Mikhail I. Mendelev, and Kai-Ming Ho
Molecular dynamics simulations are performed to study the structure and dynamical heterogeneity in the liquid and glass states of Al using a frequently employed embedded atom potential. While the pair correlation function of the glass and liquid states displays only minor differences, the icosahedra ... [Phys. Rev. B 77, 184202 (2008)] published Tue May 13, 2008.

Promising Red Phosphors (Ca,Eu,M)(WO[sub 4])[sub 1 - z](MoO[sub 4])[sub z] (M = Mg,Zn) for Solid-State Lighting

Shikao Shi, Jing Gao, and Ji Zhou
The red phosphor systems containing CaEuM(WO)(MoO) as well as CaEuM(WO)(MoO) (x=0.24, y=0.06, z=01, M=Mg, Zn), were synthesized through solid-state reactions at high temperature, and their luminescent properties were reported. All of the phosphors were effectively excited by near-UV 395 nm light ... [J. Electrochem. Soc. 155, H525 (2008)] published Tue May 13, 2008.

Density, Surface Tension, and Electrical Conductivity of Ternary Molten Carbonate System Li[sub 2]CO[sub 3]--Na[sub 2]CO[sub 3]--K[sub 2]CO[sub 3] and Methods for Their Estimation

Toshikatsu Kojima, Yoshinori Miyazaki, Katsuhiro Nomura, and Kazumi Tanimoto
The density, surface tension, and electrical conductivity of the ternary molten salt mixtures of LiCONaCOKCO system have been measured. The molar volumes of the ternary mixtures agreed well with those estimated by additivity arguments within 0.7%. It was found that the surface tension of a ternary c ... [J. Electrochem. Soc. 155, F150 (2008)] published Tue May 13, 2008.

Characteristics of Hafnium--Zirconium--Oxide Film Treated by Remote Plasma Nitridation

Seungjun Lee, Seokhwan Bang, Sunyeol Jeon, Semyung Kwon, Wooho Jeong et al.
Characteristics of hafniumzirconiumoxide films, with and without remote plasma nitridation, have been investigated. The films were created by atomic layer deposition. After deposition, remote plasma nitridation was performed. Nitrogen atoms were successfully incorporated into the hafniumzirconiumoxi ... [J. Electrochem. Soc. 155, H516 (2008)] published Tue May 13, 2008.

Evolution of Surface Morphology, Crystallite Size, and Texture of WO[sub 3] Layers Sputtered onto Si-Supported Nanoporous Alumina Templates

V. Khatko, A. Mozalev, G. Gorokh, D. Solovei, F. Guirado et al.
Thin Al films sputtered on n-silicon wafers were anodized in two potentiodynamic steps in 0.4 M tartaric acid at 210 V and 0.4 M malonic acid at 95 V to prepare nanoporous alumina templates of type A and B, respectively. Processes at the Al/n-Si interface were closely examined to avoid field-ass ... [J. Electrochem. Soc. 155, K116 (2008)] published Tue May 13, 2008.

An investigation of phonon decay in B[sub 12]As[sub 2] by Raman scattering spectroscopy

J. C. Gray, J. W. Pomeroy, M. Kuball, Z. Xu, J. H. Edgar et al.
Raman scattering spectroscopy was used to study the spectral linewidth and frequency of characteristic phonon modes of boron arsenide (BAs) as a function of temperature between 7 and 680 K. A combination of two- and three-phonon decay processes was found to dominate the dynamics of the intra-icosahe ... [J. Appl. Phys. 103, 093537 (2008)] published Tue May 13, 2008.

Controlled synthesis and characterization of Ag[sub 2]S films with varied microstructures and its role as asymmetric barrier layer in trilayer junctions with dissimilar electrodes

I. C. Lekshmi, G. Berera, Y. Afsar, G. X. Miao, T. Nagahama et al.
In this study, we examine the possibility of electrode-barrier interactions in modifying the electrical characteristics and current switching behavior of a trilayer junction with silver sulfide as the barrier layer. A series of AlAgSAg crossbar junction is fabricated by thermal evaporation technique ... [J. Appl. Phys. 103, 093719 (2008)] published Tue May 13, 2008.

Si interstitial contribution of F[sup +] implants in crystalline Si

Pedro Lopez, Lourdes Pelaz, R. Duffy, P. Meunier-Beillard, F. Roozeboom et al.
The F effect in crystalline Si is quantified by monitoring defects and B diffusion in samples implanted with 25 keV F and/or 40 keV Si. We estimate that about +0.4 Si interstitials are generated per implanted F ion, in agreement with the value resulting from the net separation of Frenkel pairs. For ... [J. Appl. Phys. 103, 093538 (2008)] published Tue May 13, 2008.

Excitation wavelength dependence of the visible photoluminescence from amorphous ZnO granular films

W. C. Zhang, X. L. Wu, H. T. Chen, J. Zhu, and G. S. Huang
Amorphous ZnO granular films were fabricated by anodizing zinc sheet in 0.5M oxalic acid solution under direct current voltage. The photoluminescence spectrum of the as-anodized sample shows a very broad visible emission band, which can be Gaussian divided into two subbands at 525 and 600 nm. Based ... [J. Appl. Phys. 103, 093718 (2008)] published Tue May 13, 2008.

Sensitive detection of weak absorption signals in photoacoustic spectroscopy by using derivative spectroscopy and wavelet transform

Jincun Zheng, Zhilie Tang, Yongheng He, and Lina Guo
This report presents a practical analytical method of photoacoustic (PA) spectroscopy that is based on wavelet transform (WT) and the first-derivative PA spectrum. An experimental setup is specially designed to obtain the first-derivative spectrum, which aims to identify some unnoticeable absorption ... [J. Appl. Phys. 103, 093116 (2008)] published Tue May 13, 2008.

Thermal stability of sputtered Cu films with nanoscale growth twins

O. Anderoglu, A. Misra, H. Wang, and X. Zhang
We have investigated the thermal stability of sputter-deposited Cu thin films with a high density of nanoscale growth twins by using high-vacuum annealing up to 800 degrees C for 1 h. Average twin lamella thickness gradually increased from approximately 4 nm for as-deposited films to slightly less ... [J. Appl. Phys. 103, 094322 (2008)] published Tue May 13, 2008.

Laser-induced self-organization in silicon-germanium thin films

M. Weizman, N. H. Nickel, I. Sieber, and B. Yan
We report on the formation of self-organized structures in thin films of silicon-germanium (SiGe) with 0.3