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Condensed Matter papers — page 103

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Frequency Dependence of Aging, Rejuvenation and Memory in a disordered ferroelectric
We characterize in details the aging properties of the ferroelectric phase of K Ta1-x Nbx O3 (KTN), where both rejuvenation and (partial) memory are observed. In particular, we carefully examine…
J. P. Bouchaud, P. Doussineau, T. de Lacerda-Arôso et al.Nov 10, 2000
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Polaron features of the one-dimensional Holstein Molecular Crystal Model
The polaron features of the one-dimensional Holstein Molecular Crystal Model are investigated by improving a variational method introduced recently and based on a linear superposition of Bloch states…
V. Cataudella, G. De Filippis, G. IadonisiNov 10, 2000
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Multi-mode description of an interacting Bose-Einstein condensate
We study the equilibrium dynamics of a weakly interacting Bose-Einstein condensate trapped in a box. In our approach we use a semiclassical approximation similar to the description of a multi-mode…
K. Goral, M. Gajda, K. RzazewskiNov 9, 2000
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Finite temperature oscillations of a Bose-Einstein condensate in a two-gas model
The temperature dependence of the frequencies of a Bose-Einstein condensate obtained in experiment has not been fully understood theoretically. In this paper we present a simplified version of a…
R. Bach, M. Brewczyk, K. RzazewskiNov 9, 2000
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Quantum Phase Transitions and Vortex Dynamics in Superconducting Networks
Josephson junction arrays are ideal model systems where a variety of phenomena, phase transitions, frustration effects, vortex dynamics, chaos, to mention a few of them, can be studied in a…
Rosario Fazio, Herre van der ZantNov 9, 2000
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Chaotic motion of space charge wavefronts in semiconductors under time-independent voltage bias
A standard drift-diffusion model of space charge wave propagation in semiconductors has been studied numerically and analytically under dc voltage bias. For sufficiently long samples, appropriate…
I. R. Cantalapiedra, M. J. Bergmann, L. L. Bonilla et al.Nov 9, 2000
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Thermodynamics of trapped interacting bosons in one dimension
On the basis of Bethe ansatz solution of bosons with delta-function interaction in a one-dimensional potential well, the thermodynamics equilibrium of the system in finite temperature is studied by…
Shi-Jian Gu, You-Quan Li, Zu-Jian YingNov 9, 2000
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Nonlinear transport theory for hybrid normal-superconducting devices
We report a theory for analyzing nonlinear DC transport properties of mesoscopic or nanoscopic normal-superconducting (N-S) systems. Special attention was paid such that our theory satisfies gauge…
Jian Wang, Yadong Wei, Hong Guo et al.Nov 9, 2000
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Excitonic emission in the presence of a two dimensional electron gas: a microscopic understanding
The near- and far-field photoluminescence spectra of a gated two-dimensional electron gas have been measured. Spatial fluctuations in the electron density are found to be manifested as spatial…
Y. Yayon, M. Rappaport, V. Umansky et al.Nov 8, 2000
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Interlayer Exchange Coupling Mediated by Valence Band Electrons
The interlayer exchange coupling mediated by valence band electrons in all-semiconductor IV-VI magnetic/nonmagnetic superlattices is studied theoretically. A 3D tight-binding model, accounting for…
J. Blinowski, P. KacmanNov 8, 2000
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Localize energy in random media: A new phase state
This Letter reports a new wave phenomenon. We show that wave energy can be stored in random media. Associated with such energy storage is a global collective behavior. The features depicted are so…
Zhen Ye, Kang-Xin WangNov 8, 2000
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An entropy-driven noise-induced phase transition
We introduce a class of exactly solvable models which exhibit an ordering noise-induced phase transition driven by an entropic mechanism. In contrast with previous studies, order does not appear in…
M. Ibanes, J. Garcia-Ojalvo, R. Toral et al.Nov 8, 2000
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Dynamics and Scaling of Noise-Induced Domain Growth
The domain growth processes originating from noise-induced nonequilibrium phase transitions are analyzed, both for non-conserved and conserved dynamics. The existence of a dynamical scaling regime is…
M. Ibanes, J. Garcia-Ojalvo, R. Toral et al.Nov 8, 2000
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Crossing the coexistence line at constant magnetization
Using Monte Carlo histogram methods, the microcanonical caloric curve is computed for the Ising model in two and three dimensions with fixed magnetization. Whereas the signatures of a first order…
Michel Pleimling, Alfred HuellerNov 7, 2000
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Explaining critical angular velocities of the vortex formation in a stirred Bose-Einstein condensate
The problem of explanation of the critical angular velocity Ωc when the formation of a vortex in the stirred Bose-Einstein condensate becomes energetically possible, is considered in the framework…
A. A. KozhevnikovNov 7, 2000
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CaB6: a new semiconducting material for spin electronics
Ferromagnetism was recently observed at unexpectedly high temperatures in La-doped CaB6. The starting point of all theoretical proposals to explain this observation is a semimetallic electronic…
H. J. Tromp, P. van Gelderen, P. J. Kelly et al.Nov 7, 2000
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The Schrodinger Cat Family in Attractive Bose Gases and Their Interference
We show that the ground state of an attractive Bose gas in a double well evolves from a coherent state to a Schrodinger Cat like state as the tunneling barrier is decreased. The latter exhibits…
Tin-Lun Ho, C. V. CiobanuNov 6, 2000
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Image charges revisited: a closed form solution
We demonstrate that the corrections to the classical Kelvin image theory due to finite electron screening length λ, recently discussed by Roulet and Saint Jean, Am. J. Phys. 68(4) 319, is amenable…
T. C. ChoyNov 6, 2000
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Acetylene on Si(100) from first principles: adsorption geometries, equilibrium coverages and thermal decomposition
Adsorption of acetylene on Si(100) is studied from first principles. We find that, among a number of possible adsorption configurations, the lowest-energy structure is a ``bridge''…
Pier Luigi Silvestrelli, Flavio Toigo, Francesco AncilottoNov 6, 2000
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Spinon Attraction in Spin-1/2 Antiferromagnetic Chains
We derive the representation of the two-spinon wavefunction for the Haldane-Shastry model in terms of the spinon coordinates. This result allows us to rigorously analyze spinon interaction and its…
B. A. Bernevig, D. Giuliano, R. B. LaughlinNov 3, 2000
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Superconductor-Insulator Quantum Phase Transitions
In these lectures, superconductivity in impure thin films close to the absolute zero of temperature is discussed. The behavior as function of the applied magnetic field and the amount of impurities…
Adriaan M. J. SchakelNov 2, 2000
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Effective Lorentz Force due to Small-angle Impurity Scattering: Magnetotransport in High-Tc Superconductors
We show that a scattering rate which varies with angle around the Fermi surface has the same effect as a periodic Lorentz force on magnetotransport coefficients. This effect, together with the…
C. M. Varma, Elihu AbrahamsNov 1, 2000
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Magnetic properties of a new molecular-based spin-ladder system: (5IAP)2CuBr4*2H2O
We have synthesized and characterized a new spin-1/2 Heisenberg antiferromagnetic ladder: bis 5-iodo-2-aminopyridinium tetrabromocuprate(II) dihydrate. X-ray diffraction studies show the structure of…
C. P. Landee, M. M. Turnbull, C. Galeriu et al.Nov 1, 2000
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Global Optimization and the Energy Landscapes of Dzugutov Clusters
The global minima of clusters bound by a Dzugutov potential form non-compact polytetrahedral clusters mainly composed of interpenetrating and face-sharing 13-atom icosahedra. As the size increases,…
Jonathan Doye, David Wales, Sergei SimdyankinNov 1, 2000
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A repulsive trap for two electrons in a magnetic field
We study numerically and analytically the dynamics of two classical electrons with Coulomb interaction in a two dimensional antidot superlattice potential in the presence of crossed electric and…
A. L. Chepelianskii, D. L. ShepelyanskyNov 1, 2000
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