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Condensed Matter papers — page 118

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Vector lattice model for stresses in granular materials
A vector lattice model for stresses in granular materials is proposed. A two dimensional pile built by pouring from a point is constructed numerically according to this model. Remarkably, the pile…
Onuttom NarayanApr 24, 2000
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Quasiperiodic time dependent current in driven superlattices: distorted Poincare maps and strange attractors
Intriguing routes to chaos have been experimentally observed in semiconductor superlattices driven by an ac field. In this work, a theoretical model of time dependent transport in ac driven…
David Sanchez, Gloria Platero, Luis L. BonillaApr 24, 2000
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Twin wall of cubic-tetragonal ferroelastics
We derive solutions for the twin wall linking two tetragonal variants of the cubic-tetragonal ferroelastic transformation, including for the first time the dilatational and shear energies and…
S. H. Curnoe, A. E. JacobsApr 24, 2000
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Local functional models of critical correlations in thin-films
Recent work on local functional theories of critical inhomogeneous fluids and Ising-like magnets has shown them to be a potentially exact, or near exact, description of universal finite-size effects…
A. O. Parry, E. D. Macdonald, C. RasconApr 20, 2000
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Influence of Induced Interactions on the Superfluid Transition in Dilute Fermi Gases
We calculate the effects of induced interactions on the transition temperature to the BCS state in dilute Fermi gases. For a pure Fermi system with 2 species having equal densities, the transition…
H. Heiselberg, C. J. Pethick, H. Smith et al.Apr 20, 2000
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Evidence for an energy scale for quasiparticle dispersion in Bi2Sr2CaCu2O8
Quasiparticle dispersion in Bi2Sr2CaCu2O8 is investigated with improved angular resolution as a function of temperature and doping. Unlike the linear dispersion predicted by the band…
P. V. Bogdanov, A. Lanzara, S. A. Kellar et al.Apr 20, 2000
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Bose-Einstein Condensates in Optical Lattices: Spontaneous Emission in the Presence of Photonic Band Gaps
An extended Bose-Einstein condensate (BEC) in an optical lattice provides a kind of periodic dielectric and causes band gaps to occur in the spectrum of light propagating through it. We examine the…
Karl-Peter Marzlin, Weiping ZhangApr 19, 2000
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Moment of Inertia and Quadrupole Response Function of a Trapped Superfluid
We derive an explicit relationship between the moment of inertia and the quadrupole response function of an interacting gas confined in a harmonic trap. The relationship holds for both Bose and Fermi…
Francesca Zambelli, Sandro StringariApr 19, 2000
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Topological defect system in O(n) symmetric time-dependent Ginzburg-Landau model
We present a new generalized topological current in terms of the order parameter field ϕ to describe the topological defect system in O(n) symmetric time-dependent Ginzburg-Landau model. With…
Ying JiangApr 19, 2000
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Dirac Fermions on a Two-Dimensional Lattice and the Intermediate Metallic Phase
Consequences of different discretizations of the two-dimensional Dirac operator on low energy properties (e.g., the number of nodes) and their relations to gauge properties are discussed. Breaking of…
K. ZieglerApr 18, 2000
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Relaxation Processes in Administered-Rate Pricing
We show how a novel application of the theory of anelasticity unifies the observed dynamics and proposed models of administered-rate products. This theory yields a straightforward approach to rate…
Raymond J. Hawkins, Michael R. ArnoldApr 18, 2000
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Weakly Interacting Bose-Einstein Condensates Under Rotation: Mean-field versus Exact Solutions
We consider a weakly-interacting, harmonically-trapped Bose-Einstein condensed gas under rotation and investigate the connection between the energies obtained from mean-field calculations and from…
A. D. Jackson, G. M. Kavoulakis, B. Mottelson et al.Apr 18, 2000
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Weakly-interacting Bose-Einstein condensates under rotation
We investigate the ground and low excited states of a rotating, weakly interacting Bose-Einstein condensed gas in a harmonic trap for a given angular momentum. Analytical results in various limits,…
G. M. Kavoulakis, B. Mottelson, C. J. PethickApr 18, 2000
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Stable 85Rb Bose-Einstein Condensates with Widely Tunable Interactions
Bose-Einstein condensation has been achieved in a magnetically trapped sample of 85Rb atoms. Long-lived condensates of up to 104 atoms have been produced by using a magnetic-field-induced Feshbach…
S. L. Cornish, N. R. Claussen, J. L. Roberts et al.Apr 17, 2000
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Bosonization Rules for Electron-Hole Systems - II
Here we write down and prove closed commutation rules for Fermi bilinears in a two-component Fermi system in terms of the relevant sea-bosons. We show how the commutation rules come out correctly…
Girish S. SetlurApr 17, 2000
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Dynamics of the Bose-Einstein condensate: quasi-one-dimension and beyond
It is shown that the quasi-one-dimensional Bose-Einstein condensate is experimentally accessible and rich in intriguing phenomena. We demonstrate numerically and analytically the existence,…
Lincoln D. Carr, Mary Ann Leung, William P. ReinhardtApr 17, 2000
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Thermopower in p-type GaAs/AlGaAs layers
We explain for the first time thermopower data for p-type GaAs/AlGaAs layers. The data span a temperature range between 0.2 to 1.2K. We calculate both the diffusion Sd and the phonon-drag…
M. Tsaousidou, P. N. Butcher, P. A. Crump et al.Apr 17, 2000
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Lattice models and Landau theory for type II incommensurate crystals
Ground state properties and phonon dispersion curves of a classical linear chain model describing a crystal with an incommensurate phase are studied. This model is the DIFFOUR (discrete frustrated…
G. H. F. van Raaij, K. J. H. van Bemmel, T. JanssenApr 17, 2000
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Formation of Directed Beams from Atom Lasers
The problem of creating well-collimated beams of atoms escaping from a trap is studied. This problem is of high importance for the realization of atom lasers. Nonadiabatic dynamics of neutral atoms…
V. I. Yukalov, E. P. YukalovaApr 17, 2000
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Excited Coherent Modes of Ultracold Trapped Atoms
A method of exciting coherent spatial modes of Bose-condensed trapped atoms is considered. The method is based on the resonance modulation of the trapping potential. The population dynamics of…
V. I. Yukalov, E. P. Yukalova, V. S. BagnatoApr 17, 2000
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Reversible and irreversible evolution of a condensed bosonic gas
We have formulated a kinetic theory for a condensed atomic gas in a trap, i.e., a generalized Gross-Pitaevskii equation, as well as a quantum-Boltzmann equation for the normal and anomalous…
R. Walser, J. Cooper, M. HollandApr 15, 2000
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The Semiclassical Propagator for Spin Coherent States
We use a continuous-time path integral to obtain the semiclassical propagator for minimal-spread spin coherent states. We pay particular attention to the ``extra phase'' discovered by Solari…
Michael Stone, Kee-Su Park, Anupam GargApr 14, 2000
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Laterally coupled few-electron quantum dots
We present ground-state calculations for laterally coupled quantum dots containing 2, 4, and 8 electrons. As our emphasis is on spin effects our results are obtained by applying spin-density…
Andreas Wensauer, Oliver Steffens, Michael Suhrke et al.Apr 13, 2000
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Zero-temperature equation of state of quasi-one dimensional H2
We have studied molecular hydrogen in a pure 1D geometry and inside a narrow carbon nanotube by means of the diffusion Monte Carlo method. The one-dimensionality of H2 in the nanotube is well…
M. C. Gordillo, J. Boronat, J. CasullerasApr 12, 2000
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"Scars" in parametrically excited surface waves
We consider the Faraday surface waves of a fluid in a container with a non-integrable boundary shape. We show that, at sufficiently low frequencies, the wave patterns are ``scars'' selected…
Oded Agam, Boris L. AltshulerApr 12, 2000
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