Electrical and thermal properties of carbon nanotube bulk materials: Experimental studies for the 328--958 K temperature range
Hai-Long Zhang, Jing-Feng Li, Bo-Ping Zhang, Ke-Fu Yao, Wei-Shu Liu et al.
We report on electrical and thermal properties in the temperature range from 328 to 958 K of multiwall carbon nanotube (MWNT) bulk materials that were consolidated by spark plasma sintering. The rather dense MWNT bulk materials show exclusively nonmetallic temperature dependence of electrical con ... [Phys. Rev. B 75, 205407 (2007)] published Thu May 3, 2007.
Broken spin-Hall accumulation symmetry by magnetic field and coexisted Rashba and Dresselhaus interactions
Son-Hsien Chen, Ming-Hao Liu, Kuo-Wei Chen, and Ching-Ray Chang
The spin-Hall effect in the two-dimensional electron gas (2DEG) generates symmetric out-of-plane spin S[sub z] accumulation about the current axis in the absence of external magnetic field. Here we employ the real space Landauer-Keldysh formalism [B. K. Nikolić et al., Phys. Rev. Lett. [bold ... [J. Appl. Phys. 101, 09D513 (2007)] published Thu May 3, 2007.
Synthesis and photoluminescence properties of well-aligned Ga-doped N-rich SiO[sub x]N[sub y] nanowire bundles
X. T. Zhang, Z. Liu, Z. Zheng, S. K. Hark, Y. B. Fu et al.
Well-aligned Ga-doped N-rich SiO[sub x]N[sub y] bundles were synthesized on Si substrates by chemical vapor deposition. According to the x-ray photoelectron spectroscopy spectra of the Si 2p[sub 3/2] region, the relative shifts of N 1s and chemical stabilities of all the possible tetrahedrons, the m ... [Appl. Phys. Lett. 90, 183110 (2007)] published Wed May 2, 2007.
High-mobility window for two-dimensional electron gases at ultrathin AlN/GaN heterojunctions
Yu Cao and Debdeep Jena
High-conductivity two-dimensional electron gases at AlN/GaN heterojunctions are reported. The sheet densities can be tuned from ~5 x 10[sup 12]/cm[sup 2] to ~5 x 10[sup 13]/cm[sup 2] by varying the AlN thickness from 2 to 7 nm. A critical thickness is observed beyond which biaxial strain relaxa ... [Appl. Phys. Lett. 90, 182112 (2007)] published Wed May 2, 2007.
Lorentz model for metamaterials: Optical frequency resonance circuits
T. P. Meyrath, T. Zentgraf, and H. Giessen
We illustrate the strong connection between optics and high-frequency electronics by presenting circuit calculations for resonant metamaterials in the optical frequency range. An RLC circuit model is considered. Equations for impedances are derived and used to calculate the resonance positions and q ... [Phys. Rev. B 75, 205102 (2007)] published Wed May 2, 2007.
Spin pumping from finite-sized electron systems in ballistic and diffusive transport regimes
Kiminori Hattori
This paper presents a theory for spin pumping from finite-sized conductors at paramagnetic resonance. The spin generation and transport in the system exposed to a rotating magnetic field are analyzed by using the nonequilibrium Green's-function formalism, showing that a time-independent spin current ... [Phys. Rev. B 75, 205302 (2007)] published Wed May 2, 2007.
Pulse-induced acoustoelectric vibrations in surface-gated GaAs-based quantum devices
S. Rahman, T. M. Stace, H. P. Langtangen, M. Kataoka, and C. H. W. Barnes
We present the results of a numerical investigation which show the excitation of acoustoelectric modes of vibration in GaAs-based heterostructures due to sharp nanosecond electric-field pulses applied across surface gates. In particular, we show that the pulses applied in quantum information process ... [Phys. Rev. B 75, 205303 (2007)] published Wed May 2, 2007.
Resonant reflection at magnetic barriers in quantum wires
Hengyi Xu, T. Heinzel, M. Evaldsson, S. Ihnatsenka, and I. V. Zozoulenko
The conductance of a quantum wire containing a single magnetic barrier is studied numerically by means of the recursive Green's function technique. For sufficiently strong and localized barriers, Fano-type reflection resonances are observed close to the pinch-off regime. They are attributed to a mag ... [Phys. Rev. B 75, 205301 (2007)] published Wed May 2, 2007.
Nonequilibrium charge-Kondo transport through negative-U molecules
Jens Koch, Eran Sela, Yuval Oreg, and Felix von Oppen
Low-temperature transport through molecules with effectively negative charging energy U exhibits a charge-Kondo effect. We explore this regime analytically by establishing an exact mapping between the negative-U and the positive-U Anderson models, which is suitable for the description of nonequilibr ... [Phys. Rev. B 75, 195402 (2007)] published Wed May 2, 2007.
Electron transport in n-doped Si/SiGe quantum cascade structures
I. Lazic, Z. Ikonic, V. Milanovic, R. W. Kelsall, D. Indjin et al.
An electron transport model in n-Si/SiGe quantum cascade or superlattice structures is described. The model uses the electronic structure calculated within the effective-mass complex-energy framework, separately for perpendicular (X[sub z]) and in-plane (X[sub xy]) valleys, the degeneracy of which i ... [J. Appl. Phys. 101, 093703 (2007)] published Wed May 2, 2007.
Square-gradient mechanism of surface scattering in quasi-one-dimensional rough waveguides
M. Rendon, F. M. Izrailev, and N. M. Makarov
We develop a perturbative approach that allows one to study surface scattering in quasi-one-dimensional waveguides with rough boundaries. Our approach is based on the construction of an effective bulk potential of a very complicated structure. A detailed analysis of this potential reveals that apart ... [Phys. Rev. B 75, 205404 (2007)] published Tue May 1, 2007.
Surface second-harmonic generation from surface plasmon waves scattered by metallic nanostructures
Lina Cao, N. C. Panoiu, and R. M. Osgood, Jr.
We analyze second-harmonic (SH) generation from scattering of surface plasmon polaritons (SPPs) by one-dimensional metallic nanostructures. The electromagnetic field at the fundamental frequency (FF) is calculated by using a formalism based on the reduced Rayleigh equations, in which the arbitrary s ... [Phys. Rev. B 75, 205401 (2007)] published Tue May 1, 2007.
Dimensional transition of Cd[sub x]Zn[sub 1 - x]Te nanostructures grown on ZnTe layers
H. S. Lee, H. L. Park, and T. W. Kim
The atomic force microscopy images showed that the dimensional structural transformation from Cd[sub x]Zn[sub 1x]Te quantum dots (QDs) with Cd mole fractions of 0.5 and 0.6 to Cd[sub x]Zn[sub 1x]Te quantum wires occurred at a Cd mole fraction of 0.8. Photoluminescence spectra showed that the exciton ... [Appl. Phys. Lett. 90, 181909 (2007)] published Tue May 1, 2007.
Sharp Superconductor-Insulator Transition in Short Wires
Dganit Meidan, Yuval Oreg, and Gil Refael
Recent experiments on short MoGe nanowires show a sharp superconducting-insulating transition at the universal resistance R[sub Q]=h/(4e[sup 2]), contrary to the expectation of a smooth temperature dependence of the resistance for such Josephson-like systems. We present a self-consistent renormaliza ... [Phys. Rev. Lett. 98, 187001 (2007)] published Tue May 1, 2007.
Entanglement detection for electrons via witness operators
Lara Faoro and Fabio Taddei
We discuss an implementation of the entanglement witness, a method to detect entanglement with few local measurements, in systems where entangled electrons are generated both in the spin and orbital degrees of freedom. We address the efficiency of this method in various setups, including two differe ... [Phys. Rev. B 75, 165327 (2007)] published Mon Apr 30, 2007.
Interminiband Rabi oscillations in biased semiconductor superlattices
Pavel Abumov and D. W. L. Sprung
Carrier dynamics at energy level anticrossings in biased semiconductor superlattices was studied in the time domain by solving the time-dependent Schrodinger equation. The resonant nature of interminiband Rabi oscillations has been explicitly demonstrated to arise from the interference of intrawell ... [Phys. Rev. B 75, 165421 (2007)] published Mon Apr 30, 2007.
Quantum inductance and negative electrochemical capacitance at finite frequency in a two-plate quantum capacitor
Jian Wang, Baigeng Wang, and Hong Guo
We report on theoretical investigations of frequency-dependent quantum capacitance. It is found that at finite frequency, a quantum capacitor can be characterized by a classical RLC circuit with three parameters: a static electrochemical capacitance, a charge relaxation resistance, and a quantum ind ... [Phys. Rev. B 75, 155336 (2007)] published Mon Apr 30, 2007.
Temperature-dependent matching in a flux-line lattice interacting with a triangular array of pinning centers without long-range order
J. Eisenmenger, M. Oettinger, C. Pfahler, A. Plettl, P. Walther et al.
A triangular array of nanoscaled artificial pinning centers (APCs) for magnetic flux lines is prepared into a Nb thin film. The APCs are formed by deposition of Nb onto a Si substrate covered with nanopillars with diameters of 20 nm and lattice constant a=122 nm. The production of pillars is based ... [Phys. Rev. B 75, 144514 (2007)] published Mon Apr 30, 2007.
Manipulation of the vortex motion in nanostructured ferromagnetic/superconductor hybrids
A. V. Silhanek, W. Gillijns, V. V. Moshchalkov, V. Metlushko, F. Gozzini et al.
The authors investigate the rectified motion of vortices in superconducting films deposited on top of a close-packed array of open in-plane magnetized triangular micromagnets. The dc voltage induced by the vortex drift under an ac excitation is recorded for three different magnetic configurations of ... [Appl. Phys. Lett. 90, 182501 (2007)] published Mon Apr 30, 2007.
Effect of Measurement Probes upon the Conductance of an Interacting Nanosystem: Detection of an Attached Ring by Nonlocal Many Body Effects
Axel Freyn and Jean-Louis Pichard
We consider a nanosystem connected to measurement probes via leads. When a magnetic flux is varied through a ring attached to one lead at a distance L[sub c] from the nanosystem, the effective nanosystem transmission |t[sub s]|[sup 2] exhibits Aharonov-Bohm oscillations if the electrons interact ins ... [Phys. Rev. Lett. 98, 186401 (2007)] published Mon Apr 30, 2007.
Self-assembly of periodic nanoclusters of Si and Ge along atomically straight steps of a vicinal Si(111)
Takeharu Sekiguchi, Shunji Yoshida, Yohei Shiren, Kohei M. Itoh, Josef Mysliveček et al.
The very initial stage of the molecular beam epitaxy of Si and Ge on Si(111)7 x 7 substrates with atomically straight steps has been studied by scanning tunneling microscopy and spectroscopy. The atomically straight steps have been prepared on a miscut Si(111) substrate by annealing at 830 degrees ... [J. Appl. Phys. 101, 081702 (2007)] published Fri Apr 27, 2007.
Seeing emergent phases in quantum Hall double layers
Vittorio Pellegrini, Stefano Luin, Biswajit Karmakar, Aron Pinczuk, Brian S. Dennis et al.
We review recent studies by optics methods of emergent phases in the quantum Hall (QH) regimes of double layers with finite tunneling at Landau level filling factor nu=1. In measurements of spin excitations by inelastic light scattering and of elastically scattered Rayleigh light under the applicati ... [J. Appl. Phys. 101, 081718 (2007)] published Fri Apr 27, 2007.
Dimensional Control of Antilocalization and Spin Relaxation in Quantum Wires
S. Kettemann
The weak localization correction to the conductivity of quantum wires with linear Rashba-Dresselhaus spin-orbit coupling is derived analytically as function of wire width W. The spin relaxation rate is found to decrease as W becomes smaller than the spin-precession length L[sub SO]. As a result, the ... [Phys. Rev. Lett. 98, 176808 (2007)] published Fri Apr 27, 2007.
Criterion for Negative Refraction with Low Optical Losses from a Fundamental Principle of Causality
Mark I. Stockman
From the fundamental requirement of causality, we derive a rigorous criterion of negative refraction (left handedness). This criterion imposes the lower limits on the electric and magnetic losses in the region of the negative refraction. If these losses are eliminated or significantly reduced by any ... [Phys. Rev. Lett. 98, 177404 (2007)] published Fri Apr 27, 2007.
Statistical Approach to Investigating Transport through Single Molecules
Emanuel Lortscher, Heiko B. Weber, and Heike Riel
We present a statistical approach that combines comprehensive current-voltage data acquisition during the controlled manipulation of a molecular junction with subsequent statistical analysis. Thereby the most probable transport characteristics can be determined. The excellent sensitivity of this imp ... [Phys. Rev. Lett. 98, 176807 (2007)] published Fri Apr 27, 2007.
Comment on ``All-Angle Broadband Negative Refraction of Metal Waveguide Arrays in the Visible Range: Theoretical Analysis and Numerical Demonstration''
Viktor A. Podolskiy and Evgenii E. Narimanov
A Comment on the Letter by Xiebin Fan et al., Phys. Rev. Lett. [bold 97], 073901 (2006). The authors of the Letter offer a Reply. ... [Phys. Rev. Lett. 98, 179401 (2007)] published Fri Apr 27, 2007.
Lin et al. Reply:
Weihua Lin, Guo Ping Wang, Jeffrey Chi Wai Lee, and C. T. Chan
A Reply to the Comment by Viktor A. Podolskiy and Evgenii E. Narimanov. ... [Phys. Rev. Lett. 98, 179402 (2007)] published Fri Apr 27, 2007.
Quantum critical transport, duality, and M theory
Christopher P. Herzog, Pavel Kovtun, Subir Sachdev, and Dam Thanh Son
We consider charge transport properties of 2+1 dimensional conformal field theories at nonzero temperature. For theories with only Abelian U(1) charges, we describe the action of particle-vortex duality on the hydrodynamic-to-collisionless crossover function: this leads to powerful functional constr ... [Phys. Rev. D 75, 085020 (2007)] published Fri Apr 27, 2007.
Optical Absorption Edge of SnTe Thin Films
N. N. Zheleva, D. B. Kushev, St. B. Peshkalova, and T. N. Nevzat
Transmissivity and refelectivities of SnTe thin films are measured for determination of the optical band gap. Step like form of the absorption edge spectral dependence appear for sample thicknesses less than 0.3 [mu]m. There is also shifting of the absorption edge to higher energy. (C)2007 American ... [AIP Conf. Proc. 899, 690 (2007)] published Fri Apr 27, 2007.
Antireflection Multilayer Structures for Inclined Incident Light
I. K. Miloushev, T. K. Tenev, R. A. Peyeva, and K. P. Panajotov
The performed studies for antireflection coatings at 1.06 [mu]m spectral range and inclined incident light are described. Antireflection structures of SiO, ZnS and Na[sub 3]AlF[sub 6] are discussed. (C)2007 American Institute of Physics ... [AIP Conf. Proc. 899, 686 (2007)] published Fri Apr 27, 2007.
Growth and Characterization of Carbon Nanostructures
Yusuf Selamet and Gorkem Yuce
Carbon nanostructures were grown by arc-discharge method and characterized by SEM, AFM, STM, and XRD techniques. We observe broadening in the radial distribution of nanofibers grown with Co and Ni application. The nanofibers grown with Co/Ni application were straighter and shorter in length than nan ... [AIP Conf. Proc. 899, 459 (2007)] published Fri Apr 27, 2007.
Percolation under Quantum Hall Effect Conditions
Valeriy Arkhincheev
The percolation under Quantum Hall Effect conditions in inhomogeneous medium is studied. The lower and upper bound values are founded, which are different from values for metal conductivity. It is connected with unusual character of current percolation under QHE regime. (C)2007 American Institute of ... [AIP Conf. Proc. 899, 235 (2007)] published Fri Apr 27, 2007.
Hall magnetoresistivity response under microwave excitation revisited
Jesus Inarrea
The authors theoretically analyzed the microwave-induced modification of the Hall magnetoresistivity in high mobility two-dimensional electron systems. These systems present diagonal magnetoresistivity oscillations and zero-resistance states when subjected to microwave radiation. The most surprising ... [Appl. Phys. Lett. 90, 172118 (2007)] published Fri Apr 27, 2007.
Sagnac Rotational Phase Shifts in a Mesoscopic Electron Interferometer with Spin-Orbit Interactions. [arXiv:0705.0388v1]
ePrint arXiv http://arXiv.org/
On the Dynamical Ferromagnetic, Quantum Hall, and Relativistic Effects on the Carbon Nanotubes Nucleation and Growth Mechanism. [arXiv:0705.0407v1]
ePrint arXiv http://arXiv.org/
Intrinsic spin Hall effect in platinum metal. [arXiv:0705.0409v1]
ePrint arXiv http://arXiv.org/
Correlators and fractional statistics in the quantum Hall bulk. [arXiv:0705.0360v1]
ePrint arXiv http://arXiv.org/
Comment on ``Intensity correlations and mesoscopic fluctuations of diffusing photons in cold atoms''. [arXiv:0705.0366v1]
ePrint arXiv http://arXiv.org/
Coupled spin-charge drift-diffusion equations for the Rashba model. [arXiv:0705.0415v1]
ePrint arXiv http://arXiv.org/
Orthogonality catastrophe and Kondo effect in graphene. [arXiv:0705.0522v1]
ePrint arXiv http://arXiv.org/
Colors Of Graphite On Silicon Dioxide. [arXiv:0705.0492v1]
ePrint arXiv http://arXiv.org/
Microwave Absorption of Surface-State Electrons on Liquid $^3$He. [arXiv:0705.0417v1]
ePrint arXiv http://arXiv.org/
Quantum q-breathers in a finite Bose-Hubbard chain: The case of two interacting bosons. [arXiv:cond-mat/0701701v2 UPDATED]
ePrint arXiv http://arXiv.org/
Continuously Tunable Charge in Andreev Quantum Dots. [arXiv:cond-mat/0610180v2 UPDATED]
ePrint arXiv http://arXiv.org/
Photo-assisted Andreev reflection as a probe of quantum noise. [arXiv:cond-mat/0602408v2 UPDATED]
ePrint arXiv http://arXiv.org/
Attraction between electrons in a metallic dot capacitively coupled to a superconducting island. [arXiv:cond-mat/0703412v3 UPDATED]
ePrint arXiv http://arXiv.org/