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Condensed Matter papers — page 65

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Vortices in vibrated granular rods
We report the experimental observation of novel vortex patterns in vertically vibrated granular rods. Above a critical packing fraction, moving ordered domains of nearly vertical rods spontaneously…
Daniel L. Blair, T. Neicu, A. KudrolliMar 11, 2002
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Directional Emission from a Microdisk Resonator with a Linear Defect
Microdisk resonator with a linear defect at some distance away from the circumference is studied theoretically. We demonstrate that the presence of the defect leads to ( i) enhancement of the…
V. M. Apalkov, M. E. RaikhMar 10, 2002
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On the Spherical Two-Dimensional Electron Gas
We investigate the many-body properties of a two-dimensional electron gas constrained to the surface of a sphere, a system which is physically realized in multielectron bubbles in liquid helium. A…
J. Tempere, I. F. Silvera, J. T. DevreeseMar 10, 2002
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Monte Carlo simulations of an impurity band model for III-V diluted magnetic semiconductors
We report the results of a Monte Carlo study of a model of (III,Mn)V diluted magnetic semiconductors which uses an impurity band description of carriers coupled to localized Mn spins and is…
Malcolm P. Kennett, Mona Berciu, R. N. BhattMar 7, 2002
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Hysteresis in driven disordered systems: From plastic depinning to magnets
We study the dynamics of a viscoelastic medium driven through quenched disorder by expanding about mean field theory in 6-ε dimensions. The model exhibits a critical point separating a region where…
M. Cristina Marchetti, Karin A. DahmenMar 7, 2002
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Stochastic Calculus for Assets with Non-Gaussian Price Fluctuations
From the path integral formalism for price fluctuations with non-Gaussian distributions I derive the appropriate stochastic calculus replacing Ito's calculus for stochastic fluctuations.
Hagen KleinertMar 7, 2002
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Cooper pairing and single particle properties of trapped Fermi gases
We calculate the elementary excitations and pairing of a trapped atomic Fermi gas in the superfluid phase. The level spectra and pairing gaps undergo several transitions as the strength of the…
G. M. Bruun, H. HeiselbergMar 6, 2002
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Deformed Harmonic Oscillators for Metal Clusters: Analytic Properties and Supershells
The analytic properties of Nilsson's Modified Oscillator (MO), which was first introduced in nuclear structure, and of the recently introduced, based on quantum algebraic techniques,…
Dennis Bonatsos, D. Lenis, P. P. Raychev et al.Mar 6, 2002
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Enhanced cohesion of matter on a cylindrical surface
We evaluate the cohesive energies Eb of four systems in which particles move on a cylindrical surface, at fixed distance R from the axis. We find quite nonuniversal dependences of Eb on R. For…
M. K. Kostov, M. W. Cole, G. D. Mahan et al.Mar 6, 2002
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Current-density functional for disordered systems
The effective action for the current and density is shown to satisfy an evolution equation, the functional generalization of Callan-Symanzik equation. The solution describes the dependence of the…
Janos PolonyiMar 5, 2002
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Optical generation of quasisolitons in a single-component gas of neutral fermionic atoms
We analyze, the generation of soliton-like solutions in a single-component Fermi gas of neutral atoms at zero and finite temperatures with the phase imprinting method. By using both the numerical and…
T. Karpiuk, M. Brewczyk, L. Dobrek et al.Mar 5, 2002
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Third-generation muffin-tin orbitals
By the example of sp3-bonded semiconductors, we illustrate what 3rd-generation muffin-tin orbitals (MTOs) are. We demonstrate that they can be downfolded to smaller and smaller basis sets:…
O. K. Andersen, T. Saha-Dasgupta, S. EzhovMar 5, 2002
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Time Scales for Cold-Welding and the Origins of Stick-Slip Friction
Data from an instrument that measures conductance, stiffness and rupture strength of junctions indicates that when two macroscopic metal surfaces are brought into contact a nanometer size junction…
R. Budakian, S. J. PuttermanMar 5, 2002
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Force Detection Using a Fiber-Optic Cantilever
A force measurement technique has been developed that utilizes a clamped fiber optic element both as a cantilever and as a highly sensitive probe of the static and dynamic displacement of a sample…
R. Budakian, S. J. PuttermanMar 4, 2002
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Analytic Evaluation of Four-Particle Integrals with Complex Parameters
The method for analytic evaluation of four-particle integrals, proposed by Fromm and Hill, is generalized to include complex exponential parameters. An original procedure of numerical branch tracking…
V. S. Zotev, T. K. RebaneMar 4, 2002
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Symmetry Properties of Anisotropic Superfluids
A system of equations is developed for a fluid with non-abelian local gauge symmetry. Anisotropy is introduced by requiring that the symmetry breaking preserves a restricted local gauge symmetry…
James V. Lindesay, Harry L. MorrisonMar 3, 2002
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Lessons of Coherence and Decoherence--From Neutrinos to SQUIDS
We indicate some of the lessons learned from our work on coherence and decoherence in various fields and mention some recent work with sold state devices as elements of the ``quantum…
L. StodolskyMar 1, 2002
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The few-body problem for trapped bosons with large scattering length
We calculate energy levels of two and three bosons trapped in a harmonic oscillator potential with oscillator length a osc. The atoms are assumed to interact through a short-range…
S. Jonsell, H. Heiselberg, C. J. PethickMar 1, 2002
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Electron and Phonon Temperature Relaxation in Semiconductors Excited by Thermal Pulse
Electron and phonon transient temperatures are analyzed in the case of nondegenerate semiconductors. An analytical solution is obtained for rectangular laser pulse absorption. It is shown that…
Yu. G. Gurevich, G. N. Logvinov, A. F. Carballo-Sanchez et al.Feb 28, 2002
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"Resonance" phenomena in thermal diffusion processes in two-layer structures
The dependence on chopper frequency of the effective thermal diffusivity and effective thermal conductivity in photoacoustic experiments is discussed. The theoretical model of a two-layer structure…
Yu. G. Gurevich, G. N. Logvinov, N. Munoz-Aguirre et al.Feb 28, 2002
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Total-energy-based structure prediction for d(AlNiCo)
One may predict a quasicrystal structure starting from electrons and quantum mechanics, as approximated by interatomic pair potentials calibrated with ab-initio total-energy calculations, combined…
Christopher L. Henley, Marek Mihalkovic, Michael WidomFeb 28, 2002
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Modelling a Dune Field
We present a model to describe the collective motion of barchan dunes in a field. Our model is able to reproduce the observation that a typical dune stays confined within a stripe. We also obtain…
A. R. Lima, G. Sauermann, H. J. Herrmann et al.Feb 28, 2002
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Revealing Superfluid--Mott-Insulator Transition in an Optical Lattice
We study (by an exact numerical scheme) the single-particle density matrix of 103 ultracold atoms in an optical lattice with a parabolic confining potential. Our simulation is directly…
V. A. Kashurnikov, N. V. Prokof'ev, B. V. SvistunovFeb 27, 2002
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Bose-enhanced chemistry: Amplification of selectivity in the dissociation of molecular Bose-Einstein condensates
We study the photodissociation chemistry of a quantum degenerate gas of bosonic triatomic ABC molecules, assuming two open rearrangement channels (AB+C or A+BC). The equations of motion are…
M. G. Moore, A. VardiFeb 27, 2002
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Large scale numerical investigation of excited states in poly(phenylene)
A density matrix renormalisation group scheme is developed, allowing for the first time essentially exact numerical solutions for the important excited states of a realistic semi-empirical model for…
Robert J. Bursill, W. BarfordFeb 27, 2002
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