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Condensed Matter papers — page 3

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Correlated Electron Transport
Theoretical and experimental values to date for the resistances of single molecules commonly disagree by orders of magnitude. By reformulating the transport problem using boundary conditions suitable…
P. Delaney, J. C. GreerDec 19, 2003
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Controlled vortex-sound interactions in atomic Bose-Einstein condensates
The low temperature dynamics of a vortex in a trapped quasi-two-dimensional Bose-Einstein condensate are studied quantitatively. Precession of an off-centred vortex in a dimple trap, embedded in a…
N. G. Parker, N. P. Proukakis, C. F. Barenghi et al.Dec 19, 2003
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Rotational dynamics of CO solvated in small He clusters: a quantum Monte Carlo study
The rotational dynamics of CO single molecules solvated in small He clusters (CO@HeN) has been studied using Reptation Quantum Monte Carlo for cluster sizes up to N=30. Our results are in good…
Paolo Cazzato, Stefano Paolini, Saverio Moroni et al.Dec 19, 2003
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Dephasing in Quantum Dots: Quadratic Coupling to Acoustic Phonons
A microscopic theory of optical transitions in quantum dots with carrier-phonon interaction is developed. Virtual transitions into higher confined states with acoustic phonon assistance add a…
E. A. Muljarov, R. ZimmermannDec 19, 2003
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Controlling the coexistence of structural phases and the optical properties of gallium nanoparticles with optical excitation
We have observed reversible structural transformations, induced by optical excitation at 1.55 micrometer, between the beta, gamma and liquid phases of gallium in self-assembled gallium nanoparticles,…
K. F. MacDonald, V. A. Fedotov, S. Pochon et al.Dec 18, 2003
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Nonlinear Band Gap Transmission in Optical Waveguide Arrays
The effect of nonlinear transmission in coupled optical waveguide arrays is theoretically investigated via numerical simulations on the corresponding model equations. The realistic experimental setup…
Ramaz KhomerikiDec 18, 2003
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Dispersive charge transport along the surface of an insulating layer observed by Electrostatic Force Microscopy
We report the observation in the direct space of the transport of a few thousand charges submitted to a tunable electric field along the surface of a silicon oxide layer. Charges are both deposited…
J. S. Lambert, G. De Loubens, C. Guthmann et al.Dec 18, 2003
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Dynamic Anomalies of Fluids with Isotropic Doubled-Ranged Potential
Using molecular dynamics simulations we investigate the ability of an analytical three-dimensional double well in reproducing static and dynamic anomalies found experimentally in liquid water. We…
Paulo Netz, J. F. Raymundi, Adriana S. Camera et al.Dec 18, 2003
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Space-filling bearings in three dimensions
We present the first space-filling bearing in three dimensions. It is shown that a packing which contains only loops with even number of spheres can be constructed in a self-similar way and that it…
R. Mahmoodi Baram, H. J. Herrmann, N. RivierDec 18, 2003
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Kinetic theory of spin transport in n-typed semiconductor quantum wells
We set up a set of many-body kinetic Bloch equations with spacial inhomogeneity. We reexamine the widely adopted quasi-independent electron model (QIEM) and show the inadequacy of this model in…
M. Q. Weng, M. W. WuDec 18, 2003
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Phase coexistence in Gallium nanoparticles controlled by electron excitation
In Gallium nanoparticles of 100 nm in diameter grown on the tip of an optical fiber from an atomic beam we observed equilibrium coexistence of gamma, beta and liquid structural phases that can be…
S. Pochon, K. F. MacDonald, R. J. Knize et al.Dec 17, 2003
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Stability of strained heteroepitaxial systems in (1+1) dimensions
We present a simple analytical model for the determination of the stable phases of strained heteroepitaxial systems in (1+1) dimensions. In order for this model to be consistent with a subsequent…
P. Thibault, L. J. LewisDec 17, 2003
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Kondo Effect and Surface-State Electrons
We have used low temperature scanning tunneling spectroscopy and atomic manipulation to study the role of surface-state electrons in the Kondo effect of an isolated cobalt atom adsorbed on Ag(111).…
L. Limot, R. BerndtDec 17, 2003
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Nonextensive scalar field theories and dark energy models
Current astronomical measurements indicate that approximately 73% of the universe is made up of dark energy. Stochastically quantized self-interacting scalar fields can serve as suitable models to…
Christian BeckDec 17, 2003
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Josephson Current Counterflow in Atomic Bose-Einstein Condensates
Josephson weak links in superconductors can be engineered such that the phase difference across the junction is π (π-junction),leading to the reversal of the current. The conditions under which…
E. Sakellari, N. P. Proukakis, M. Leadbeater et al.Dec 17, 2003
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Spin oscillations in transient diffusion of a spin pulse in n-type semiconductor quantum wells
By studying the time and spatial evolution of a pulse of the spin polarization in n-type semiconductor quantum wells, we highlight the importance of the off-diagonal spin coherence in spin…
M. Q. Weng, M. W. Wu, Q. W. ShiDec 17, 2003
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Gibbons-Hawking Effect in the Sonic de Sitter Space-Time of an Expanding Bose-Einstein-Condensed Gas
We propose an experimental scheme to observe the Gibbons-Hawking effect in the acoustic analog of a 1+1-dimensional de Sitter universe, produced in an expanding, cigar-shaped Bose-Einstein…
Petr O. Fedichev, Uwe R. FischerDec 15, 2003
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Self-similar space-filling packings in three dimensions
We develop an algorithm to construct new self-similar space-filling packings of spheres. Each topologically different configuration is characterized by its own fractal dimension. We also find the…
Reza Mahmoodi Baram, Hans J. HerrmannDec 14, 2003
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Nanoscale Quantum Solvation of para-H2 around the Linear OCS Molecule inside 4He Droplets
We present a microscopic analysis of the quantum solvation structures of para-H2 around the OCS molecule when embedded in low temperature 4He droplets. The structures of clusters containing M=5…
Yongkyung Kwon, K. Birgitta WhaleyDec 13, 2003
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Ultrametricity in Fund of Funds Diversification
Minimum market transparency requirements impose Hedge Fund (HF) managers to use the statement declared strategy in practice. However each declared strategy may actually origin a multiplicity of…
Gabriele Susinno, Maria Augusta MiceliDec 12, 2003
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Growth of GaMnAs under near-stoichiometric conditions
We studied the effect of the V/III flux ratio and substrate temperature on magnetotransport properties and lattice parameters of Ga0.96Mn0.04As grown by molecular beam epitaxy. For all the substrate…
V. Avrutin, D. Humienik, S. Frank et al.Dec 12, 2003
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Radiative corrections to the excitonic molecule state in GaAs microcavities
The optical properties of excitonic molecules (XXs) in GaAs-based quantum well microcavities (MCs) are studied, both theoretically and experimentally. We show that the radiative corrections to the XX…
A. L. Ivanov, P. Borri, W. Langbein et al.Dec 11, 2003
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Surface location of sodium atoms attached to He-3 nanodroplets
We have experimentally studied the electronic 3p← 3s excitation of Na atoms attached to 3He droplets by means of laser-induced fluorescence as well as beam depletion spectroscopy. From…
F. Stienkemeier, O. Bunermann, R. Mayol et al.Dec 11, 2003
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General expressions for the electrical resistivity and thermal conductivity of twinned crystals
General expressions are derived for the electrical resisitivity and thermal conductivity of a twinned single crystal. Particular attention is paid to the effect of the structure of the twin domains…
V. W. WittorffDec 11, 2003
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On the economy of web links: Simulating the exchange process
In the modern web economy hyperlinks have already attained monetary value as incoming links to a web site can increase its visibility on major search engines. Thus links can be viewed as investment…
Boris Galitsky, Mark LeveneDec 9, 2003
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