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Condensed Matter papers — page 187

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Coexistence of Band Jahn Teller Distortion and superconductivity in correlated systems
The co-existence of band Jahn-Teller (BJT) effect with superconductivity (SC) is studied for correlated systems, with orbitally degenerate bands using a simple model. The Hubbard model for a doubly…
Haranath Ghosh, Manidipa Mitra, S. N. Behera et al.Feb 6, 1998
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Large Bipolaron in a Polaron-Gas Background
A criterion, proposed by the present authors, is used to derive numerical results for the stability of a large bipolaron embedded in a polaron gas. The main conclusion is that an isolated metastable…
M. A. Smondyrev, A. A. Shanenko, J. T. DevreeseFeb 6, 1998
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Burgers velocity fields and dynamical transport processes
We explore a connection of the forced Burgers equation with the Schrödinger (diffusive) interpolating dynamics in the presence of deterministic external forces. This entails an exploration of the…
P. Garbaczewski, G. KondratFeb 5, 1998
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Electrical properties of a-antimony selenide
This paper reports conduction mechanism in a- over a wide range of temperature (238K to 338K) and frequency (5Hz to 100kHz). The d.c. conductivity measured as a function of temperature shows…
Sanjeev Gautam, D. K. Shukla, Shelly Jain et al.Feb 4, 1998
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Ginzburg-Landau Theory for Impure Superfluid 3He
Liquid 3He at low temperatures is an ideal substance to study because of its natural purity. The superfluid state, which appears at temperatures below 3 mK, has many unusual and exciting properties.…
E. V. ThunebergFeb 4, 1998
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Logarithmic Conformal Field Theory Solutions of Two Dimensional Magnetohydrodynamics
We consider the application of logarithmic conformal field theory in finding solutions to the turbulent phases of 2-dimensional models of magnetohydrodynamics. These arise upon dimensional reduction…
Spyros Skoulakis, Steven ThomasFeb 3, 1998
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Classical Many-particle Clusters in Two Dimensions
We report on a study of a classical, finite system of confined particles in two dimensions with a two-body repulsive interaction. We first develop a simple analytical method to obtain equilibrium…
G. Date, M. V. N. Murthy, Radhika VathsanFeb 3, 1998
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Quantum sticking, scattering and transmission of 4He atoms from superfluid 4He surfaces
We develop a microscopic theory of the scattering, transmission, and sticking of 4He atoms impinging on a superfluid 4He slab at near normal incidence, and inelastic neutron scattering from the slab.…
C. E. Campbell, E. Krotscheck, M. SaarelaFeb 3, 1998
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Diffusion of Classical Solitons
We study the diffusion and deformation of classical solitons coupled to thermal noise. The diffusion coefficient for kinks in the ϕ4 theory is predicted up to the second order in kT. The…
J. Dziarmaga, W. ZakrzewskiFeb 3, 1998
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Ground-state properties of bosons in three- and two-dimensional traps
We study trapped systems of bosons at zero temperature in three and two dimensions. Conditions are fulfilled for the application of Gross-Pitaevskii theory with a positive scattering length. Series…
Augusto Gonzalez, Aurora PerezFeb 3, 1998
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Critical properties of Ising model on Sierpinski fractals. A finite size scaling analysis approach
The present paper focuses on the order-disorder transition of an Ising model on a self-similar lattice. We present a detailed numerical study, based on the Monte Carlo method in conjunction with the…
J. M. Carmona, U. Marini Bettolo Marconi, J. J. Ruiz-Lorenzo et al.Feb 2, 1998
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Inversion of K3C60 Reflectance Data
We outline a procedure for obtaining the electron-phonon spectral density by inversion of optical conductivity data, a process very similar in spirit to the McMillan-Rowell inversion of tunelling…
F. Marsiglio, T. Startseva, J. P. CarbotteFeb 2, 1998
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Numerical study of the two dimensional Heisenberg model by Green Function Monte Carlo at fixed number of walkers
We describe in detail a simple and efficient Green Function Monte Carlo technique for computing both the ground state energy and the ground state properties by the ``forward walking'' scheme.…
M. Calandra, S. SorellaFeb 2, 1998
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Burgers' Flows as Markovian Diffusion Processes
We analyze the unforced and deterministically forced Burgers equation in the framework of the (diffusive) interpolating dynamics that solves the so-called Schrödinger boundary data problem for the…
P. Garbaczewski, G. Kondrat, R. OlkiewiczFeb 2, 1998
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Some New Exact Ground States for Generalize Hubbard Models
A set of new exact ground states of the generalized Hubbard models in arbitrary dimensions with explicitly given parameter regions is presented. This is based on a simple method for constructing…
Sergio Albeverio, Shao-Ming FeiFeb 2, 1998
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Flow instability in 3He-A as analog of generation of hypermagnetic field in early Universe
It is now well-recognized that the Universe may behave like a condensed matter system in which several phase transitions have taken place. Superconductors and the superfluid phases of 3He are…
M. Krusius, T. Vachaspati, G. E. VolovikFeb 1, 1998
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Critical phenomena at edges and corners
Using Monte Carlo techniques, the critical behaviour at edges and corners of the three-dimensional Ising model is studied. In particular, the critical exponent β2 of the local magnetization at…
M. Pleimling, W. SelkeJan 30, 1998
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Event horizons and ergoregions in 3He
Event horizons for fermion quasiparticles naturally arise in moving textures in superconductors and Fermi superfluids. We discuss the example of a planar soliton moving in superfluid 3He-A, which is…
T. A. Jacobson, G. E. VolovikJan 29, 1998
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Density of States and Energy Gap in Andreev Billiards
We present numerical results for the local density of states in semiclassical Andreev billiards. We show that the energy gap near the Fermi energy develops in a chaotic billiard. Using the same…
A. Lodder, Yu. V. NazarovJan 29, 1998
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Extreme Type-II Superconductors in a Magnetic Field: A Theory of Critical Fluctuations
A theory of critical fluctuations in extreme type-II superconductors subjected to a finite but weak external magnetic field is presented. It is shown that the standard Ginzburg-Landau representation…
Zlatko TesanovicJan 28, 1998
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Between Poisson and GUE statistics: Role of the Breit-Wigner width
We consider the spectral statistics of the superposition of a random diagonal matrix and a GUE matrix. By means of two alternative superanalytic approaches, the coset method and the graded eigenvalue…
Klaus M. Frahm, Thomas Guhr, Axel M"uller-GroelingJan 28, 1998
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A model for ripple instabilities in granular media
We extend the model of surface granular flow proposed in bcre to account for the effect of an external `wind', which acts as to dislodge particles from the static bed, such that a…
Orestis Terzidis, Philippe Claudin, Jean-Philippe BouchaudJan 28, 1998
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A Langevin Approach to Stock Market Fluctuations and Crashes
We propose a non linear Langevin equation as a model for stock market fluctuations and crashes. This equation is based on an identification of the different processes influencing the demand and…
Jean-Philippe Bouchaud, Rama ContJan 27, 1998
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NaV2O5 as a quarter-filled ladder compound
A new X-ray diffraction study of the one-dimensional spin-Peierls compound α-NaV2O5 reveals a centrosymmetric (Pmmn) crystal structure with one type of V site, contrary to the previously postulated…
H. Smolinski, C. Gros, W. Weber et al.Jan 27, 1998
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Phase diagrams of systems with two coupled order parameters
Within the framework of an exactly solvable model, which takes into account the interaction of fluctuating modes with equal and opposite momenta, we consider phase diagrams in systems with coupled…
D. Nicolaides, A. A. LisyanskyJan 27, 1998
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