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Condensed Matter papers — page 156

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`Baryonic' bound-state instability in trapped fermionic atoms
We consider a homogeneous gas of spin-S fermionic atoms, as might occur near the center of an optical trap. In the case where all scattering lengths are negative and of the same magnitude we…
A. S. Stepanenko, J. M. F. GunnJan 27, 1999
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Patterns arising from the interaction between scalar and vectorial instabilities in two-photon resonant Kerr cavities
We study pattern formation associated with the polarization degree of freedom of the electric field amplitude in a mean field model describing a nonlinear Kerr medium close to a two-photon resonance,…
Miguel Hoyuelos, Daniel Walgraef, Pere Colet et al.Jan 27, 1999
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Reaction Diffusion Models in One Dimension with Disorder
We study a large class of 1D reaction diffusion models with quenched disorder using a real space renormalization group method (RSRG) which yields exact results at large time. Particles (e.g. of…
Pierre Le Doussal, Cecile MonthusJan 27, 1999
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Pseudogaps and Extrinsic Losses in Photoemission Experiments on Poorly Conducting Solids
It is shown that a photoelectron, on being emitted from a conducting solid, suffers a substantial energy change due to ohmic losses. Almost all of this energy loss takes place after the electron…
Robert JoyntJan 26, 1999
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Group-Theoretical Analysis of Second Harmonic Generation at (110) and (111) Surfaces of Antiferromagnets
Extending our previous work we classify the nonlinear magneto-optical response at low index surfaces of fcc antiferromagnets, such as NiO. Antiferromagnetic bilayers are discussed here as models for…
M. Trzeciecki, W. HübnerJan 26, 1999
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Convective and Absolute Instabilities in the Subcritical Ginzburg-Landau Equation
We study the nature of the instability of the homogeneous steady states of the subcritical Ginzburg-Landau equation in the presence of group velocity. The shift of the absolute instability threshold…
Pere Colet, Daniel Walgraef, Maxi San MiguelJan 26, 1999
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AC-Conductivity of Pinned Charge Density Wave Fluctuations in Quasi One-Dimensional Conductors
Quasi one-dimensional conductors which undergo a Peierls transition to a charge density wave state at a temperature TP show a region of one-dimensional fluctuations above TP. The…
W. WonnebergerJan 26, 1999
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The Josephson Plasma Resonance in Bi2Sr2CaCu2O8 in a Tilted Field
The dependence of the Josephson plasma frequency omegap in Bi2Sr2CaCu2O8 on a tilted field H is reported. Measurements over a large range of B and tilt angle theta allow a detailed comparison…
Sibel P. Bayrakci, Ophelia K. C. Tsui, N. P. Ong et al.Jan 26, 1999
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Segregation of Granular Mixtures in a Rotating Drum
We formulate a phenomenological model for the segregation of binary mixtures of rough and smooth granular materials in a rotating drum. Our model successfully replicates a range of experimental…
Sanjay Puri, Hisao HayakawaJan 25, 1999
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Generalized Lotka-Volterra (GLV) Models and Generic Emergence of Scaling Laws in Stock Markets
This is a pedagogical review of the the Generalized Lotka-Volterra (GLV) model: wi(t+1) = lambda * wi(t) + a * W (t) - c * W (t) * wi(t) where i=1, >......, N and W= (w1 + w2 + ...wN)/N is the…
Sorin SolomonJan 23, 1999
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Modelling Molecular Motors as Folding-Unfolding Cycles
We propose a model for motor proteins based on a hierarchical Hamiltonian that we have previously introduced to describe protein folding. The proposed motor model has high efficiency and is…
Alex Hansen, Mogens H. Jensen, Kim Sneppen et al.Jan 22, 1999
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Moment scaling at the sol - gel transition
Two standard models of sol-gel transition are revisited here from the point of view of their fluctutations in various moments of both the mass-distribution and the gel-mass. Bond-percolation model is…
R. Botet, M. PloszajczakJan 22, 1999
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Moment of inertia of a trapped superfluid gas of atomic Fermions
The moment of inertia of a trapped superfluid gas of atomic Fermions (6Li) is calculated as a function of two system parameters: temperature and deformation of the trap. For moderate deformations at…
M. Farine, P. Schuck, X. VinasJan 22, 1999
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Influence of finite Hund rules and charge transfer on properties of Haldane systems
We consider the Kondo-Hubbard model with ferromagnetic exchange coupling % JH, showing that it is an approximate effective model for late transition metal-O linear systems. We study the…
A. E. Feiguin, Liliana Arrachea, A. A. AligiaJan 21, 1999
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Algorithm for normal random numbers
We propose a simple algorithm for generating normally distributed pseudo random numbers. The algorithm simulates N molecules that exchange energy among themselves following a simple stochastic rule.…
J. F. Fernandez, Carlos CriadoJan 20, 1999
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Stability and diffusion of surface clusters
Using kinetic Monte Carlo simulations and a bond-counting ansatz, thermal stability and diffusion of an adatom island on a crystal surface are studied. At low temperatures, the diffusion constant D…
T. Muller, W. SelkeJan 20, 1999
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Dispersion of passive tracers in velocity field with non delta-correlated noise
The diffusive properties in velocity fields whose small scales are parameterized by non δ-correlated noise is investigated using multiscale technique. The analytical expression of the eddy…
P. Castiglione, A. CrisantiJan 20, 1999
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Equivalent Linear Two-Body Equations for Many-Body Systems
A method has been developed for obtaining equivalent linear two-body equations (ELTBE) for the system of many (N) bosons using the variational principle. The method has been applied to the…
Alexander L. Zubarev, Yeong E. KimJan 19, 1999
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From the magnetic-field-driven transitions to the zero-field transition in two-dimensions
For more than a decade it was widely accepted that two-dimensional electrons are insulating at zero temperature and at zero magnetic-field. Experimentally it was demonstrated that, when placed in a…
Y. Hanein, D. Shahar, Hadas Shtrikman et al.Jan 19, 1999
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The Extended Coupled Cluster Treatment of Correlations in Quantum Magnets
The spin-half XXZ model on the linear chain and the square lattice are examined with the extended coupled cluster method (ECCM) of quantum many-body theory. We are able to describe both the…
J. Rosenfeld, N. E. Ligterink, R. F. BishopJan 19, 1999
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The effect of temperature jumps during polymer crystallization
Temperature changes during the growth of lamellar polymer crystals give rise to steps on the surface of the crystals. It has recently been suggested that these steps could provide important insights…
Jonathan Doye, Daan FrenkelJan 19, 1999
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Asymptotic temperature dependence of the superfluid density in liquid 4He
In a modified ideal Bose gas model we derive an expression for the temperature dependence of the superfluid fraction in liquid 4He. This expression leads to a fit formula for the asymptotic…
Torsten FliessbachJan 19, 1999
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Theory of excitations of the condensate and non-condensate at finite temperatures
We give an overview of the current theory of collective modes in trapped atomic gases at finite temperatures, when the dynamics of the condensate and non-condensate must both be considered. A simple…
Allan GriffinJan 18, 1999
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Spin relaxation of conduction electrons
Prospect of building electronic devices in which electron spins store and transport information has revived interest in the spin relaxation of conduction electrons. Since spin-polarized currents…
Jaroslav Fabian, S. Das SarmaJan 18, 1999
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Current self-oscillations, spikes and crossover between charge monopole and dipole waves in semiconductor superlattices
Self-sustained current oscillations in weakly-coupled superlattices are studied by means of a self-consistent microscopic model of sequential tunneling including boundary conditions naturally.…
David Sanchez, Miguel Moscoso, Luis L. Bonilla et al.Jan 18, 1999
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