Nanoscale Science And Design

Behavior of Electronic Interferometers in the Nonlinear Regime

I. Neder and E. Ginossar
We investigate theoretically the behavior of the current oscillations in an electronic Mach-Zehnder interferometer (MZI) as a function of its source bias. Recently, the MZI visibility data showed an unexplained lobe pattern with a peculiar phase rigidity. Moreover, the effect did not depend on the M ... [Phys. Rev. Lett. 100, 196806 (2008)] published Fri May 16, 2008.

Nonequilibrium Dephasing in an Electronic Mach-Zehnder Interferometer

Seok-Chan Youn, Hyun-Woo Lee, and H.-S. Sim
We study nonequilibrium dephasing in an electronic Mach-Zehnder interferometer. We demonstrate that the shot noise at the beam splitter of the interferometer generates an ensemble of nonequilibrium electron density configurations and that electron interactions induce configuration-specific phase shi ... [Phys. Rev. Lett. 100, 196807 (2008)] published Fri May 16, 2008.

A tunable all-fiber filter based on microfiber loop resonator

Wu Yu, Zeng Xu, Hou Changlun, Bai Jian, and Yang Guoguang
In this paper, a tunable high finesse microfilter is described, which is based on microfiber loop resonator (MLR). The length of microfiber loop could be controlled by a small cylindrical piezoelectric ceramic. As we calculated, this resonator has the maximum Q factor of 2400 and the finesse of 4.3. ... [Appl. Phys. Lett. 92, 191112 (2008)] published Thu May 15, 2008.

Carbon nanotube motors driven by carbon nanotube

Yoshiteru Takagi, Tsuyoshi Uda, and Takahisa Ohno
We propose a new type of carbon nanotube (CNT) motor composed of a single-wall CNT (SWCNT) and a double-wall CNT (DWCNT), that are in mechanical contact. The rotational motion of our CNT motor is controllable by the translational motion of the SWCNT along the axis of the DWCNT. From molecular dynami ... [J. Chem. Phys. 128, 194704 (2008)] published Thu May 15, 2008.

Bundling dynamics of single walled carbon nanotubes in aqueous suspensions

Goki Eda, Giovanni Fanchini, Alokik Kanwal, and Manish Chhowalla
A simple optical method based on absorption of monochromatic light to investigate the dynamics of single walled carbon nanotube (SWCNT) suspensions is described. The well dispersed suspensions display a complex behavior, exhibiting peaks due to resonant scattering from SWCNT bundles with increasing ... [J. Appl. Phys. 103, 093118 (2008)] published Thu May 15, 2008.

Self-assembly of well-aligned 3C-SiC ripples by focused ion beam

Jiaming Zhang, Qiangmin Wei, Jie Lian, Weilin Jiang, William J. Weber et al.
Well-aligned ripple structures on the surface of a single crystal of 3C-SiC were created by focused ion beam bombardment, and the resulting morphology and topography were characterized using in situ focused ion beam/scanning electron microscopy, as well as ex situ atomic force microscopy. The ripple ... [Appl. Phys. Lett. 92, 193107 (2008)] published Wed May 14, 2008.

Effects of well thickness on the spectral properties of In[sub 0.5]Ga[sub 0.5]As/GaAs/Al[sub 0.2]Ga[sub 0.8]As quantum dots-in-a-well infrared photodetectors

G. Jolley, L. Fu, H. H. Tan, and C. Jagadish
We report on the effects of the quantum well (QW) thickness on the spectral response and other characteristics of InGaAs/GaAs/AlGaAs quantum dots-in-a-well infrared photodetectors grown by low-pressure metal-organic chemical vapor deposition. The main device properties are observed to have a strong ... [Appl. Phys. Lett. 92, 193507 (2008)] published Wed May 14, 2008.

Robust single-parameter quantized charge pumping

B. Kaestner, V. Kashcheyevs, G. Hein, K. Pierz, U. Siegner et al.
This paper investigates a scheme for quantized charge pumping based on single-parameter modulation. The device was realized in an AlGaAsGaAs gated nanowire. We find a remarkable robustness of the quantized regime against variations in the driving signal, which increases with applied rf power. This f ... [Appl. Phys. Lett. 92, 192106 (2008)] published Wed May 14, 2008.

Simulation and design of planarizing materials for reverse-tone step and flash imprint lithography

Michael W. Lin, Brook Chao, Jianjun Hao, Kyle Osberg, Paul S. Ho et al.
Reverse-tone step and flash imprint lithography (SFIL-R) shows promise as a cost-efficient, high-resolution patterning technique; however, the generation of satisfactory patterns requires the successful application of a planarizing topcoat over topography through spincoating. Photopolymerizable nonv ... [J. Micro/Nanolith. MEMS MOEMS 7, 023008 (2008)] published Tue May 13, 2008.

Formation of dysprosium silicide nanowires on Si(557) with two-dimensional electronic structure

M. Wanke, K. Loser, G. Pruskil, and M. Dahne
The self-organized growth of dysprosium silicide nanowires on Si(557) has been studied using scanning tunneling microcopy and angle-resolved photoelectron spectroscopy. The nanowires grow on the (111) facets of the Si(557) surface with lengths exceeding 1000 nm and widths of 35 nm. Their metallic el ... [J. Appl. Phys. 103, 094319 (2008)] published Mon May 12, 2008.

Thermal growth and structural and optical characterization of indium tin oxide nanopyramids, nanoislands, and tubes

D. Maestre, A. Cremades, J. Piqueras, and L. Gregoratti
In-doped SnO microtubes as well as Sn-doped InO (ITO) nano- and microislands have been grown by thermal treatment of compacted SnOInO powders under argon flow at 1350 degrees C in a catalyst-free process. The SnO tubes contain about 1 at. % of In, even when the In content in the starting mixture w ... [J. Appl. Phys. 103, 093531 (2008)] published Mon May 12, 2008.

Self-assembled organic donor/acceptor nanojunction arrays

Wei Chen, Hong Liang Zhang, Han Huang, Lan Chen, and Andrew Thye Shen Wee
We have fabricated well-ordered organic donor/acceptor nanojunction arrays comprising p-sexiphenyl (6P) and C via self-assembly of C on the molecular nanotemplate of 6P nanostripes on Ag(111). Our scanning tunneling microscopy measurements show that the preferential trapping of C triplets atop 6P si ... [Appl. Phys. Lett. 92, 193301 (2008)] published Mon May 12, 2008.

Enhanced mechanical strength and ductility of metal-repaired defective carbon nanotubes: A density functional study

G. P. Zheng and H. L. Zhuang
Metal atoms are filled into the defective sites of single-walled carbon nanotube (SWCN) containing vacancy defects, resulting in a stable repaired SWCN. The tensile deformation of the repaired SWCN is investigated by spin-polarized density functional theory. Compared to the defective SWCN, the repai ... [Appl. Phys. Lett. 92, 191902 (2008)] published Mon May 12, 2008.

Tunnel spectroscopy in ac-driven quantum dot nanoresonators

J. Villavicencio, I. Maldonado, R. Sanchez, E. Cota, and G. Platero
Electronic transport in a triple quantum dot shuttle device in the presence of an ac field is analyzed within a fully quantum mechanical framework. A generalized density matrix formalism is used to describe the time evolution for electronic state occupations in a dissipative phonon bath. In the pres ... [Appl. Phys. Lett. 92, 192102 (2008)] published Mon May 12, 2008.

Current-Induced Torques Due to Compensated Antiferromagnets

Paul M. Haney and A. H. MacDonald
We analyze the influence of current-induced torques on the magnetization configuration of a ferromagnet in a circuit containing a compensated antiferromagnet. We argue that these torques are generically nonzero and determine their form by considering spin-dependent scattering at a compensated antife ... [Phys. Rev. Lett. 100, 196801 (2008)] published Mon May 12, 2008.

Mechanism of flexural resonance frequency shift of a piezoelectric microcantilever sensor during humidity detection

Qing Zhu, Wan Y. Shih, and Wei-Heng Shih
We have examined the flexural resonance frequency shift of a piezoelectric microcantilever sensor (PEMS) during humidity detection and have shown that the flexural resonance frequency shift of the PEMS during detection was a result of Young's modulus change of its piezoelectric layer. Because of the ... [Appl. Phys. Lett. 92, 183505 (2008)] published Fri May 9, 2008.

Controllable fabrication and electromechanical characterization of single crystalline Sb-doped ZnO nanobelts

Ya Yang, Junjie Qi, Yue Zhang, Qingliang Liao, Lidan Tang et al.
We report the fabrication of the high-quality Sb-doped ZnO nanobelts by using a simple chemical vapor deposition method. The nanobelts consist of single-crystalline wurtzite ZnO crystal and grow along [01[overline 1]2] direction. An electromechanical system is constructed to explore the transverse e ... [Appl. Phys. Lett. 92, 183117 (2008)] published Fri May 9, 2008.

Fully engineered homoepitaxial zinc oxide nanopillar array for near-surface light wave manipulation

J. Volk, A. Hakansson, H. T. Miyazaki, T. Nagata, J. Shimizu et al.
We report accurate light wave manipulation by means of an inverse designed homoepitaxial ZnO nanopillar array. Our proof-of-concept structure was optimized for focusing a near-surface light beam which propagates in a free-space parallel to the metal top surface. The on-purpose positioned and perpend ... [Appl. Phys. Lett. 92, 183114 (2008)] published Fri May 9, 2008.

Nanogranular structures formed by combinatorial control processing of size-selected metal nanoparticles

Seung Hun Huh, Doh Hyung Riu, Chang Yeoul Kim, Yasutomo Naono, Tsuneyuki Nakamura et al.
Nanogranular films and lines, which are composed of size-selected Au, Ni, and Pt nanoparticles (NPs) and which exhibit an intermediate structure between that of the individual NPs and that of polycrystalline ones, were produced by a fully physical process. By using a combination of techniques such a ... [J. Appl. Phys. 103, 094317 (2008)] published Fri May 9, 2008.

Magnetic-field-enhanced synthesis of single-wall carbon nanotubes in arc discharge

Michael Keidar, Igor Levchenko, Tamir Arbel, Myriam Alexander, Anthony M. Waas et al.
The ability to control the properties of single-wall nanotubes (SWNTs) produced in the arc discharge is important for many practical applications. Our experiments suggest that the length of SWNTs significantly increases (up to 4000 nm), along with the purity of the carbon deposit, when the magnetic ... [J. Appl. Phys. 103, 094318 (2008)] published Fri May 9, 2008.

Testing the consistency of the Maxwell–Stefan formulation when predicting self-diffusion in zeolites with strong adsorption sites
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Single-wall carbon nanotube synthesis by CO disproportionation on nickel-incorporated MCM-41
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Large- and small-nanopore silica prepared with a short-chain cationic fluorinated surfactant
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Polymeric worm micelles as nano-carriers for drug delivery
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Dendrimer-mediated synthesis of platinum nanoparticles: new insights from dialysis and atomic force microscopy measurements
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Adhesion of Pseudomonas fluorescens onto nanophase materials
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Engineering nanospaces: ordered mesoporous silicas as model substrates for building complex hybrid materials
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Electrical transport, Meyer–Neldel rule and oxygen sensitivity of Bi2S3
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Structural and optical characterizations of multi-layered and multi-stacked PbSe quantum dots
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Single-step synthesis of well-crystallized and pure barium titanate nanoparticles in supercritical fluids
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Contacting gold nanoparticles with carbon nanotubes by self-assembly
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Single-crystalline MgxZn1-xO (0≤x≤0.25) nanowires on glass substrates obtained by a hydrothermal method: growth, structure and
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