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Condensed Matter papers — page 98

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Memory effects in response functions of driven vortex matter
Vortex flow in driven type II superconductors shows strong memory and history dependent effects. Here, we study a schematic microscopic model of driven vortices to propose a scenario for a broad set…
Henrik Jeldtoft Jensen, Mario NicodemiJan 5, 2001
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Luminescence from highly excited nanorings: Luttinger liquid description
We study theoretically the luminescence from quantum dots of a ring geometry. For high excitation intensities, photoexcited electrons and holes form Fermi seas. Close to the emission threshold, the…
T. V. Shahbazyan, I. E. Perakis, M. E. RaikhJan 4, 2001
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Energy-transfer rate in a double-quantum-well system due to Coulomb coupling
We study the energy-transfer rate for electrons in a double-quantum-well structure, where the layers are coupled through screened Coulomb interactions. The energy-transfer rate between the layers…
R. T. Senger, B. TanatarJan 4, 2001
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Nonextensive Thermostatistics and the H-Theorem
The kinetic foundations of Tsallis' nonextensive thermostatistics are investigated through Boltzmann's transport equation approach. Our analysis follows from a nonextensive generalization of…
J. A. S. Lima, R. Silva, A. R. PlastinoJan 3, 2001
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The Physics of Electric Field Effect Thermoelectric Devices
We describe here a novel approach to the subject of thermoelectric devices. The current best thermoelectrics are based on heavily doped semiconductors or semimetal alloys. We show that utilization of…
V. Sandomirsky, A. V. Butenko, R. Levin et al.Jan 3, 2001
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Swarming ring patterns in bacterial colonies exposed to ultraviolet radiation
We report a novel morphological transition in a Bacillus subtilis colony initially growing under ambient conditions, after ultraviolet radiation exposure. The bacteria in the central regions of the…
Anna M. Delprato, Azadeh Samadani, A. Kudrolli et al.Jan 2, 2001
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Vortices in Bose-Einstein condensates confined in a multiply connected Laguerre-Gaussian optical trap
The quantized vortex state is investigated in a Bose-Einstein condensate, confined in a multiply connected geometry formed by a Laguerre-Gaussian optical trap. Solving the Gross-Pitaevskii equation…
J. Tempere, J. T. Devreese, E. R. I. AbrahamJan 2, 2001
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Multicomponent mixture of charged hard-sphere chain molecules in the polymer mean-spherical approximation
The analytical solution of the recently proposed ideal chain polymer mean-spherical approximation (Yu.Kalyuzhnyi, Mol.Phys., 94, 735(1998)) is presented for the multicomponent mixture of charged…
Yu. V. Kalyuzhnyi, P. T. CummingsJan 1, 2001
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How does the Eurodollar Interest Rate behave?
An empirical analysis on Eurodollar interest rates daily data in the time period 1990-1996, is performed and compared with Libor data in the time period 1984-1998. The complementary cumulative…
Tiziana Di Matteo, Tomaso AsteJan 1, 2001
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Dynamical turbulent flow on the Galton board with friction
We study numerically and analytically the dynamics of particles on the Galton board, a regular lattice of disc scatters, in the presence of a constant external force and friction. It is shown that…
A. D. Chepelianskii, D. L. ShepelyanskyJan 1, 2001
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Weak and strong dynamic scaling in a one-dimensional driven coupled-field model: Effects of kinematic waves
We study the coupled dynamics of the displacement fields in a one dimensional coupled-field model for drifting crystals, first proposed by R.Lahiri and S.Ramaswamy [ Phys. Rev. Lett. 79,…
Dibyendu Das, Abhik Basu, Mustansir Barma et al.Dec 31, 2000
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Theory of Multi-gap Superfluidity Based on Fermi-liquid Approach
Superfluid-to-superfluid phase transitions in a Fermi-liquid leading to the emergence of two-gap superfluid states have been studied. There are considered the systems of fermions of one and two…
A. I. Akhiezer, A. A. Isayev, S. V. Peletminsky et al.Dec 29, 2000
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Molecular dynamics simulation of the fragile glass former ortho-terphenyl: a flexible molecule model. II. Collective dynamics
We present a molecular dynamics study of the collective dynamics of a flexible model for the fragile glass-former orthoterphenyl [ S. Mossa, R. Di leonardo, G. Ruocco, and M. Sampoli, Phys. Rev. E…
S. Mossa, G. Ruocco, M. SampoliDec 27, 2000
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The polaron confined in one dimension
The ground-state energy, the effective mass and the number of virtual phonons of the optical large polaron confined strictly in one dimension have been estimated by using the generalized Gaussian…
G. GanboldDec 26, 2000
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Watching dark solitons decay into vortex rings in a Bose-Einstein condensate
We have created spatial dark solitons in two-component Bose-Einstein condensates in which the soliton exists in one of the condensate components and the soliton nodal plane is filled with the second…
B. P. Anderson, P. C. Haljan, C. A. Regal et al.Dec 22, 2000
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The re-examined phenomenological phase transitions theory for ferromagnets
The existence of the linear on the order parameter term of the thermodynamic functions expansion near the critical point is justified. The criticism of the arguments, used for the rejection of the…
V. A. SkrebnevDec 22, 2000
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Approximate formula for the ground state energy of anyons in 2D parabolic well
We determine approximate formula for the ground state energy of anyons in 2D parabolic well which is valid for the arbitrary anyonic factor νand number of particles N in the system. We assume that…
B. Abdullaev, M. Musakhanov, A. NakamuraDec 22, 2000
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Random Dirac Fermions: The su(N) Gauge Potential and ZN Twists
We obtain the disorder averaged (critical) four-point correlation functions for N species of (two-dimensional Euclidean) Dirac fermions subject to a (Gaussian) random su(N) gauge field. The replica…
M. J. BhaseenDec 22, 2000
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He-4 spectrum shift caused by He-3 admixture
The shift of a maxon-roton He-4 excitation spectrum E via the He-3 admixture is considered theoretically. The Bogoliubov formula for E(ρ, g) as a function of Bose-condensate density ρand of He-4/He-4…
D. Baranov, V. YaruninDec 21, 2000
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Optics with an Atom Laser Beam
We report on the atom optical manipulation of an atom laser beam. Reflection, focusing and its storage in a resonator are demonstrated. Precise and versatile mechanical control over an atom laser…
Immanuel Bloch, Michael Köhl, Markus Greiner et al.Dec 21, 2000
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Cold Trapped Atoms: A Mesoscopic System
The Bose-Einstein condensates recently created in trapped atomic gases are mesoscopic systems, in two senses: (a) Their size fall between macroscopic and microscopic systems; (b) They have a quantum…
Kerson HuangDec 21, 2000
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Dynamical quenching and annealing in self-organization multiagent models
We study the dynamics of a generalized Minority Game (GMG) and of the Bar Attendance Model (BAM) in which a number of agents self-organize to match an attendance that is fixed externally as a control…
E. Burgos, H. Ceva, R. P. J. PerazzoDec 21, 2000
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Bose-Einstein condensation of excitons in Cu2O
We present a parameter-free model which estimates the density of excitons in Cu2O, related to experiments that have tried to create an excitonic Bose-Einstein condensate. Our study demonstrates…
G. M. KavoulakisDec 20, 2000
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Existence and stability of atomic-molecular Bose-Einstein condensates
We analyze the model of an atomic Bose-Einstein condensate (BEC) parametrically coupled to a molecular BEC via a photoassociation process. We show that an interplay of nonlinear inter- and…
Benedict J. Cusack, Tristram J. Alexander, Elena A. Ostrovskaya et al.Dec 20, 2000
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Collisionless collective modes of fermions in magnetic traps
We present a Random-Phase-Approximation formalism for the collective spectrum of two hyperfine species of dilute 40K atoms, magnetically trapped at zero temperature and subjected to a repulsive…
P. Capuzzi, E. S. HernandezDec 20, 2000
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