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Condensed Matter papers — page 241

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Quantum Hall Effect at Finite Temperatures
Recent work on the temperature-driven delocalization in the quantum Hall regime is reviewed, with emphasis on the role of electron-electron interactions and the correlation properties of disorder. We…
D. G. PolyakovAug 4, 1996
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Charged Many-Electron -- Single Hole Complexes in a Double Quantum Well near a Metal Plate
It has been shown that the presence of a metal plate near a double quantum well with spatially separated electron and hole layers may lead to a drastic reconstruction of the system state with the…
V. I. YudsonAug 4, 1996
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Deconfined Fermions but Confined Coherence?
The cuprate superconductors and certain organic conductors exhibit transport which is qualitatively anisotropic, yet at the same time other properties of these materials strongly suggest the…
S. P. Strong, David G. ClarkeAug 2, 1996
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Comment on "Moving Glass Phase of Driven Lattices"
We consider a periodic lattice rapidly driven through a quenched random potential as a model of a moving Abrikosov lattice. In addition to the transverse phonon displacements uy, we consider the…
Leon Balents, M. Cristina Marchetti, Leo RadzihovskyAug 2, 1996
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Hysteretic creep of elastic manifolds
We study the dynamic response of driven systems in the presence of quenched disorder. A simple heuristic model for hysteretic creep of elastic manifolds is proposed and evaluated numerically. It…
Stefan Scheidl, Valerii VinokurAug 2, 1996
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The Edge Currents and Edge Potentials in IQHE (revised Version)
It is shown that an observed length in the potential drops across IQHE samples is a universal length for a given value of magnetic field which results from the quantum mechanical uncertainty relation.
F. GhaboussiAug 2, 1996
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From single to many Impurities in one-dimensional systems
We examine the effects of disorder in one-dimensional systems. We link the case of a few impurities, typical of a short quantum wire, to that of a finite density of scatterers more appropriate for a…
Thierry Giamarchi, Hélène MaureyAug 2, 1996
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A note on magnetic-field induced level-density condensation in a two-dimensional electron gas with point scatterers
The density-of-states (DOS) for a magnetized (B) two-dimensional electron gas (2DEG) containing point scatterers of arbitrary strengths, concentration (ns) and distribution is analyzed. It is…
N. Kumar, Nivedita DeoAug 2, 1996
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Quantum corrections to the conductivity of fermion - gauge field models: Application to half filled Landau level and high-Tc superconductors
We calculate the Altshuler-Aronov type quantum correction to the conductivity of 2d charge carriers in a random potential (or random magnetic field) coupled to a transverse gauge field. The gauge…
A. D. Mirlin, P. WoelfleAug 1, 1996
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Confinement and transverse conductivity in coupled Luttinger liquids
One--particle interchain hopping in a system of coupled Luttinger liquids is investigated by use of exact diagonalizations techniques. Firstly, the two chains problem of spinless fermions is studied…
S. Capponi, D. Poilblanc, F. MilaAug 1, 1996
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Collective rotations in oxides
Based on bond arguments, a Hamiltonian is introduced to describe the fundamental physics of the collective rotations of oxygen atoms in oxides. Values for the relevant material parameters are…
Emilio Artacho, Kanwal G. Singh, Guillermo Gomez-SantosAug 1, 1996
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Size and scaling in ideal polymer networks
The scattering function and radius of gyration of an ideal polymer network are calculated depending on the strength of the bonds that form the crosslinks. Our calculations are based on an exact…
M. P. Solf, T. A. VilgisAug 1, 1996
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A Solvable Model of a Glass
An analytically tractable model is introduced which exhibits both, a glass--like freezing transition, and a collection of double--well configurations in its zero--temperature potential energy…
Reimer KuehnJul 31, 1996
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Slow dynamics and aging in spin-glasses
Contribution presented by Eric Vincent in the Conference `Complex Behaviour of Glassy Systems', Sitges, Barcelona, Spain, June, 1996. It contains a review of the experimental results on Slow…
Eric Vincent, Jacques Hammann, Miguel Ocio et al.Jul 31, 1996
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Hofstadter butterflies for flat bands
Hofstadter's diagram, or the energy spectrum against the magnetic field in tight-binding systems, is obtained for the models having flat (dispersionless) one-electron band(s) that have originally…
Hideo Aoki, Masato Ando, Hajime MatsumuraJul 31, 1996
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Relaxation time for a dimer covering with height representation
This paper considers the Monte Carlo dynamics of random dimer coverings of the square lattice, which can be mapped to a rough interface model. Two kinds of slow modes are identified, associated…
C. L. HenleyJul 30, 1996
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A quantum model for the magnetic multi-valued recording
We have proposed a quantum model for the magnetic multi-valued recording in this paper. The hysteresis loops of the two-dimensional systems with randomly distributed magnetic atoms have been studied…
Lei Zhou, Shengyu Jin, Ning Xie et al.Jul 30, 1996
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Quantum model for magnetic multivalued recording in coupled multilayers
In this paper, we discuss the possibilities of realizing the magnetic multi-valued (MMV) recording in a magnetic coupled multilayer. The hysteresis loop of a double-layer system is studied…
Lei Zhou, Ning Xie, Shengyu Jin et al.Jul 30, 1996
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The phase diagram of high-Tc's: Influence of anisotropy and disorder
We propose a phase diagram for the vortex structure of high temperature superconductors which incorporates the effects of anisotropy and disorder. It is based on numerical simulations using the…
E. A. Jagla, C. A. BalseiroJul 30, 1996
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An extension of the characteristic angle method to the easy-plane spin-3/2 ferromagnet
The Characteristic Angle (CA) method [Lei Zhou and Ruibao Tao, J. Phys. A, 27 5599] developed previously for the easy-plane spin-1 magnetic systems has been successfully extended to the…
Lei Zhou, Ning Xie, Ruibao TaoJul 30, 1996
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Superfluids and Supersolids on Frustrated 2D Lattices
We study the ground state of hard-core bosons with nearest-neighbor hopping and nearest-neighbor interactions on the triangular and Kagomé lattices by mapping to a system of spins (S=12),…
Ganpathy Murthy, Daniel Arovas, Assa AuerbachJul 30, 1996
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Differences between Statistical Mechanics and Thermodynamics on the Mesoscopic Scale
We present a systematic expansion in the ratio between the level spacing and temperature and employ it to evaluate differences between statistical mechanics and thermodynamics in finite disordered…
Alex Kamenev, Yuval GefenJul 30, 1996
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Magnetization and overlap distributions of the ferromagnetic Ising model on the Cayley tree
We analyze the magnetization and the overlap distributions on the ferromagnetic Cayley tree. Two quantities are investigated: the asymptotic scaling of all the moments of the magnetization and…
R. MélinJul 30, 1996
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Spontaneous vortex phase discovered?
It is argued that a spontaneous vortex phase may exist in the recently discovered compound ErNi2B2C at temperature below 2.3K. The consequences of this proposal are discussed. In particular the…
T. K. Ng, C. M. VarmaJul 30, 1996
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Non-magnetic impurities in two- and three- dimensional Heisenberg antiferromagnets
In this paper we study in a large-S expansion effects of substituting spins by non-magnetic impurities in two- and three- dimensional Heisenberg antiferromagnets in a weak magnetic field. In…
Tai-Kai NgJul 30, 1996
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