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Condensed Matter papers — page 78

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Functional renormalization group at large N for random manifolds
We introduce a method, based on an exact calculation of the effective action at large N, to bridge the gap between mean field theory and renormalization in complex systems. We apply it to a…
Pierre Le Doussal, Kay Joerg WieseSep 11, 2001
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Control of Current Reversal in Single and Multiparticle Inertia Ratchets
We have studied the deterministic dynamics of underdamped single and multiparticle ratchets associated with current reversal, as a function of the amplitude of the external driving force. Two…
H. A. Larrondo, Fereydoon Family, C. M. ArizmendiSep 11, 2001
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Dephasing of a qubit coupled with a point-contact detector
The dephasing of a qubit coupled with a point-contact detector is theoretically studied. We calculate the time evolution of the reduced density matrix of qubit by using the perturbation expansion. We…
Yoshiaki Rikitake, Hiroshi Imamura, Yasuhiro Utsumi et al.Sep 11, 2001
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Bloch Waves and Bloch Bands of Bose-Einstein Condensates in Optical Lattices
Bloch waves and Bloch band of Bose-Einstein Condensates in optical lattices are studied. We provide further evidence for the loop structure in the Bloch band, and compute the critical values of the…
Biao Wu, Roberto B. Diener, Qian NiuSep 11, 2001
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Dynamical instability of a condensate induced by a rotating thermal gas
We study surface modes of the condensate in the presence of a rotating thermal cloud in an axisymmetric trap. By considering collisions that transfer atoms between the condensate and noncondensate,…
J. E. Williams, E. Zaremba, B. Jackson et al.Sep 10, 2001
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Separation of time-scales and reparametrization invariance for aging systems
We show that the generating functional describing the slow dynamics of spin glass systems is invariant under reparametrizations of the time. This result is general and applies for both infinite and…
Claudio Chamon, Malcolm P. Kennett, Horacio Castillo et al.Sep 7, 2001
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Phase fluctuations in atomic Bose gases
We improve on the Popov theory for partially Bose-Einstein condensed atomic gases by treating the phase fluctuations exactly. As a result, the theory becomes valid in arbitrary dimensions and is able…
J. O. Andersen, U. Al Khawaja, H. T. C StoofSep 7, 2001
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Quantum phase transitions in the J-J' Heisenberg and XY spin-1/2 antiferromagnets on square lattice: Finite-size scaling analysis
We investigate the critical parameters of an order-disorder quantum phase transitions in the spin-1/2 J-J' Heisenberg and XY antiferromagnets on square lattice. Basing on the excitation gaps…
Piotr Tomczak, Johannes RichterSep 6, 2001
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Interacting Electrons in Quantum Dots
The ground states of N-electron parabolic quantum dots in the presence of a perpendicular magnetic field are investigated. Rigorous lower bounds to the ground-state energies are obtained. It is shown…
Yeong E. Kim, Alexander L. ZubarevSep 6, 2001
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2D-Drop model applied to the calculation of step formation energies on a (111) substrate
A model is presented for obtaining the step formation energy for metallic islands on (111) surfaces from Monte Carlo simulations. This model is applied to homo (Cu/Cu(111), Ag/Ag(111)) and…
M. I. Rojas, G. E. Amilibia, M. G. Del Popolo et al.Sep 6, 2001
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Single and double qubit gates by manipulating degeneracy
A novel mechanism is proposed for single and double qubit state manipulations in quantum computation with four-fold degenerate energy levels. The principle is based on starting with a four fold…
T. Hakioglu, J. Anderson, F. WellstoodSep 6, 2001
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Explosion-implosion duality in the Bose-Einstein condensation
We show an explosion-implosion duality in the one and two dimensional Bose-Einstein condensation with or without a particular time-dependent harmonic trap. The result is independent of the strength…
Pijush K. GhoshSep 5, 2001
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Measurement-induced Squeezing of a Bose-Einstein Condensate
We discuss the dynamics of a Bose-Einstein condensate during its nondestructive imaging. A generalized Lindblad superoperator in the condensate master equation is used to include the effect of the…
Diego A. R. Dalvit, Jacek Dziarmaga, Roberto OnofrioSep 5, 2001
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Vortex lines or sheets - what is formed in dynamic drives?
In isotropic macroscopic quantum systems vortex lines can be formed while in anisotropic systems also vortex sheets are possible. Based on measurements of superfluid 3He-A, we present the principles…
V. B. Eltsov, R. Blaauwgeers, N. B. Kopnin et al.Sep 5, 2001
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Spurious diffusion in particle simulations of the Kolmogorov flow
Particle simulations of the Kolmogorov flow are analyzed by the Landau-Lifshitz fluctuating hydrodynamics. It is shown that a spurious diffusion of the center of mass corrupts the statistical…
M. Malek Mansour, C. Van den Broeck, I. Bena et al.Sep 5, 2001
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Hydrodynamic fluctuations in the Kolmogorov flow: Nonlinear regime
In a previous paper [I. Bena, M. Malek Mansour, and F. Baras, ``Hydrodynamic fluctuations in the Kolmogorov flow: Linear regime", Phys. Rev. E 59, 5503 - 5510 (1999)] the statistical properties…
I. Bena, F. Baras, M. Malek MansourSep 5, 2001
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Hydrodynamic fluctuations in the Kolmogorov flow: Linear regime
The Landau-Lifshitz fluctuating hydrodynamics is used to study the statistical properties of the linearized Kolmogorov flow. The relative simplicity of this flow allows a detailed analysis of the…
I. Bena, M. Malek Mansour, F. BarasSep 5, 2001
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A quantum beam splitter for atoms
An interferometric method is proposed to controllably split an atomic condensate in two spatial components with strongly reduced population fluctuations. All steps in our proposal are in current use…
Uffe V. Poulsen, Klaus MolmerSep 4, 2001
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Experimental study of granular surface flows via a fast camera: a continuous description
Depth averaged conservation equations are written for granular surface flows. Their application to the study of steady surface flows in a rotating drum allows to find experimentally the constitutive…
D. Bonamy, F. Daviaud, L. LaurentSep 4, 2001
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Adiabatic stabilization of excitons in intense terahertz laser
High-precise calculation of near-infrared absorption and transient spectra in bulk semiconductors irradiated by an intense terahertz (THz) laser shows that, the ionization rate of the ground-state…
Ren-Bao Liu, Bang-Fen ZhuSep 4, 2001
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Tunnel splitting and quantum phase interference in biaxial ferrimagnetic particles at excited states
The tunneling splitting in biaxial ferrimagnetic particles at excited states with an explicit calculation of the prefactor of exponent is obtained in terms of periodic instantons which are…
Yi-Hang Nie, Yan-Hong Jin, J. -Q Liang et al.Sep 3, 2001
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Yang-Baxter equation for the R-matrix of 1-D SU(n) Hubbard model
Based on the tetrahedral Zamolodchikov algebra, we prove the Yang-Baxter equation for the R-matrix of 1-D SU(n) Hubbard model. Furthermore, we present a generalization of the model.
Dan-tao Peng, Rui-hong YueSep 3, 2001
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Static critical behavior in the inactive phase of the pair contact process
Steady state properties in the absorbing phase of the 1d pair contact process (PCP) model are investigated. It is shown that, in typical absorbing states (reached by the system's dynamic…
M. C. Marques, M. A. Santos, J. F. F. MendesSep 3, 2001
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Power-Law Scaling for Communication Networks with Transmission Errors
A generic communication model of a boolean network with transmission errors is proposed to explore the power-law scaling of states' evolution in small-world networks. In the model, the power…
Jiann-Shing Lih, Jyh-Long ChernSep 2, 2001
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The Josephson plasmon as a Bogoliubov quasiparticle
We study the Josephson effect in alkali atomic gases within the two-mode approximation and show that there is a correspondence between the Bogoliubov description and the harmonic limit of the phase…
G. -S. Paraoanu, S. Kohler, F. Sols et al.Aug 31, 2001
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