Skip to content

Condensed Matter papers — page 202

cond-matBrowse archive

Estimation of the Doping Dependence of Antiferromagnetism in the Copper Oxide Material
Within the t-J model, we study the doping dependence of antiferromagnetism in the copper oxide materials by considering quantum fluctuations of spinons in the random-phase-approximation. The…
Shiping Feng, Yun Song, Zhongbing HuangAug 22, 1997
Learn
Attenuation of polarization echoes in NMR: A study of the emergence of dynamical irreversibility in many-body quantum systems
The reversal of the time evolution of the local polarization in an interacting spin system involves a sign change of the effective dipolar Hamiltonian which refocuses the 'spin diffusion'…
Patricia R. Levstein, Gonzalo Usaj, Horacio M. PastawskiAug 21, 1997
Learn
Charge Dynamics from Copper Oxide Materials
The charge dynamics of the copper oxide materials in the underdoped and optimal doped regimes is studied within the framework of the fermion-spin theory. The conductivity spectrum shows the non-Drude…
Shiping Feng, Zhongbing HuangAug 21, 1997
Learn
Unusual metallic phase in a chain of strongly interacting particles
We consider a one-dimensional lattice model with the nearest-neighbor interaction V1 and the next-nearest neighbor interaction V2 with filling factor 1/2 at zero temperature. The particles are…
E. V. Tsiper, A. L. EfrosAug 21, 1997
Learn
Single Hole Green's Functions in Insulating Copper Oxides at Nonzero Temperature
We consider the single hole dynamics in a modified t-J model at finite temperature. The modified model includes a next nearest (t') and next-next nearest (t'') hopping. The model…
J. van den Brink, O. P. SushkovAug 21, 1997
Learn
Basins of attraction of metastable states of the spherical p-spin model
We study the basins of attraction of metastable states in the spherical p-spin spin glass model, starting the relaxation dynamics at a given distance from a thermalized condition. Weighting the…
A. Barrat, S. FranzAug 20, 1997
Learn
Structural and insulator-metal quantum phase transitions on a lattice
We consider 2D gas of spinless fermions with the Coulomb and the short range interactions on a square lattice at T=0. Using exact diagonalization technique we study finite clusters up to 16 particles…
E. V. Tsiper, A. L. EfrosAug 20, 1997
Learn
Bipolaronic charge excitations in t-J two-leg ladders
We present a low-energy effective model for the charge degrees of freedom in two-leg t-J ladders. Starting from SU(2) mean-field theory, we exclude the spin degrees of freedom which have an energy…
Dmitri A. Ivanov, Patrick A. LeeAug 20, 1997
Learn
Possible chiral phase transition in two-dimensional solid 3He
We study a spin system with two- and four-spin exchange interactions on the triangular lattice, which is a possible model for the nuclear magnetism of solid 3He layers. It is found that a novel…
Tsutomu Momoi, Kenn Kubo, Koji NikiAug 19, 1997
Learn
Ground State of a Spin System with Two- and Four-spin Exchange Interactions on the Triangular Lattice
We study a spin system with both two- and four-spin exchange interactions on the triangular lattice as a possible model for the nuclear magnetism of solid 3He layers adsorbed on grafoil. The…
Kenn Kubo, Tsutomu MomoiAug 19, 1997
Learn
Collective excitations of Bose-Einstein condensed gases at finite temperatures
We have applied the Popov version of the Hartree-Fock-Bogoliubov (HFB) approximation to calculate the finite-temperature excitation spectrum of a Bose-Einstein condensate (BEC) of 87Rb atoms.…
R. J. Dodd, M. Edwards, C. W. Clark et al.Aug 19, 1997
Learn
Landscape statistics of the p-spin Ising model
The statistical properties of the local optima (metastable states) of the infinite range Ising spin glass with p-spin interactions in the presence of an external magnetic field h are investigated…
Viviane M de Oliveira, J F FontanariAug 18, 1997
Learn
Squeezing Atomic Vibrations In An Optical Lattice. A New Mechanism Of Optical Cooling
We propose a new method to obtain a squeezed matter field of atomic vibrations by use of an optical lattice, and the laser pulse technique of Garrett et al used for acoustic phonons [1]. We show that…
A. L. Burin, J. L. Birman, A. Bulatov et al.Aug 15, 1997
Learn
Glassy trapping of manifolds in nonpotential random flows
We study the dynamics of polymers and elastic manifolds in non potential static random flows. We find that barriers are generated from combined effects of elasticity, disorder and thermal…
Pierre Le Doussal, Kay Jörg WieseAug 15, 1997
Learn
The microscopic model for the magnetic subsystem in HoNi2B2C
We demonstrate that the system of localized magnetic moments in HoNi2B2C can be described by the 4-positional clock model. This model, at a proper choice of the coupling constants, yields…
V. K. Kalatsky, V. L. PokrovskyAug 15, 1997
Learn
Vertical transport in superlattices
All the principal results of this work concern the vertical transport in generic three dimensional superlattices. In the 1st chapter we make an historical introduction, then we discuss the geometry…
Daniel L. MillerAug 14, 1997
Learn
Landau damping in dilute Bose gases
Landau damping in weakly interacting Bose gases is investigated by means of perturbation theory. Our approach points out the crucial role played by Bose-Einstein condensation and yields an explicit…
L. P. Pitaevskii, S. StringariAug 14, 1997
Learn
A Growth Model for Porous Sedimentary Rocks
A growth model for porous sedimentary rocks is proposed, using a simple computer simulation algorithm. We generate the structure by ballistic deposition of particles with a bimodal size distribution.…
Sujata Tarafdar, Shashwati RoyAug 14, 1997
Learn
Macroscopic superpositions of Bose-Einstein condensates
We consider two dilute gas Bose-Einstein condensates with opposite velocities from which a monochromatic light field detuned far from the resonance of the optical transition is coherently scattered.…
Janne Ruostekoski, M. J. Collett, Robert Graham et al.Aug 13, 1997
Learn
Moving glass theory of driven lattices with disorder
We study periodic structures, such as vortex lattices, moving in a random potential. As predicted in [T. Giamarchi, P. Le Doussal Phys. Rev. Lett. 76 3408 (1996)] the periodicity in the direction…
Pierre Le Doussal, Thierry GiamarchiAug 12, 1997
Learn
The Quantum-Classical Metal
In a normal Fermi liquid, Landau's theory precludes the loss of single fermion, quantum coherence in the low energy/temperature limit. For highly anisotropic, strongly correlated metals there is…
David Clarke, Steven Strong, Paul Chaikin et al.Aug 12, 1997
Learn
Massive Charged Strings in the Description of Vortex Ring Quantum Nucleation
We demonstrate the way in which vortex rings in neutral superfluids are equivalent to massive, charged, elastic strings in an electromagnetic field defined locally on the string from a Kalb-Ramond…
Uwe R. FischerAug 11, 1997
Learn
Models for the description of uniaxially modulated materials
Models which allow an explicit application to structurally modulated substances are reviewed within the frame of a symmetry-based approach starting from discrete lattice theory. Focus is set on…
Boris Neubert, Michel Pleimling, Rolf SiemsAug 11, 1997
Learn
Canonical and Microcanonical Ensemble Approaches to Bose-Einstein Condensation: The Thermodynamics of Particles in Harmonic Traps
The thermodynamic properties of bosons moving in a harmonic trap in an arbitrary number of dimensions are investigated in the grand canonical, canonical and microcanonical ensembles by applying…
K. C. Chase, A. Z. Mekjian, L. ZamickAug 10, 1997
Learn
Effective low-energy theory for correlated carbon nanotubes
The low-energy theory for single-wall carbon nanotubes including Coulomb interactions is derived and analyzed. It describes two fermion chains without interchain hopping but coupled in a specific way…
Reinhold Egger, Alexander O. GogolinAug 8, 1997
Learn
← PreviousPage 202Next →