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Condensed Matter papers — page 149

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Numerical analysis of the dissipative two-state system with the density-matrix Hilbert-space-reduction algorithm
Ground state of the dissipative two-state system is investigated by means of the Lanczos diagonalization method. We adopted the Hilbert-space-reduction scheme proposed by Zhang, Jeckelmann and White…
Yoshihiro NishiyamaApr 19, 1999
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Spin-Charge Binding Mechanism for Superconductivity in Cuprates
A spin-charge recombination route to superconductivity, proposed earlier (1992)], is examined using the Schwinger boson representation of the t-J model. The representation is known to work well at…
Sanjoy K. SarkerApr 19, 1999
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Orientational phase transitions in anisotropic rare-earth magnets at low temperatures
Orientational phase transitions are investigated within the Heisenberg model with single-site anisotropy. The temperature dependence of the cone angle is calculated within the spin-wave theory. The…
V. Yu. Irkhin, A. A. KataninApr 18, 1999
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Bcc 4He as a Coherent Quantum Solid
In this work we investigate implications of the quantum nature of bcc 4% He. We show that it is a unique solid phase with both a lattice structure and an Off-Diagonal Long Range Order of…
Nir GovApr 18, 1999
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The sublattice magnetizations of the spin-s quantum Heisenberg antiferromagnets
We study the spin-s quantum Heisenberg antiferromagnetic models in a magnon theory free of any unphysical magnon state. Because the unphysical magnon states are completely removed in the magnon…
Bang-Gui LiuApr 17, 1999
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Low energy transition in spectral statistics of 2D interactingfermions
We study the level spacing statistics P(s) and eigenstate properties of spinless fermions with Coulomb interaction on a two dimensional lattice at constant filling factor and various disorder…
Pil Hun Song, Dima L. ShepelyanskyApr 16, 1999
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Specific heat and magnetic order in LaMnO3+δ
Magnetic and specific-heat measurements are performed in three different samples of LaMnO3+δ, with δ=0.11, 0.15 and 0.26, presenting important disorder effects, such as carrier localization, due…
L. Ghivelder, I. Abrego Castillo, M. A. Gusmao et al.Apr 16, 1999
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Fractional statistic
We improve Haldane's formula which gives the number of configurations for N particles on d states in a fractional statistic defined by the coupling g=l/m. Although nothing is changed in the…
M. C. BergèreApr 16, 1999
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Electronic states of metallic and semiconducting carbon nanotubes with bond and site disorder
Disorder effects on the density of states in carbon nanotubes are analyzed by a tight binding model with Gaussian bond or site disorder. Metallic armchair and semiconducting zigzag nanotubes are…
Kikuo HarigayaApr 16, 1999
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Microscopic Simulation of Reaction-Diffusion Processes and Applications to Population Biology and Product Marketing
We simulate reaction-diffusion processes with discrete fields. We use a novel algorithm to simulate different autocatalytic processes with trace densities. Anderson localization with a diffusive…
Eldad Bettelheim, Benny LehmannApr 14, 1999
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Anomalous Transient Current in Nonuniform Semiconductors
Nonequilibrium processes in semiconductors are considered with highly nonuniform initial densities of charge carriers. It is shown that there exist such distributions of charge densities under which…
V. I. Yukalov, E. P. Yukalova, M. R. SinghApr 14, 1999
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QHE of Bilayer Systems in the Presence of Tunneling -- ν=1/q case --
Transport properties of bilayer quantum Hall systems at ν=1/q, where q is an odd integer, are investigated. The edge theory is used for the investigation, since tunneling between the two layers…
Kentaro Nomura, Daijiro YoshiokaApr 14, 1999
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Irreversible Magnetization of Pin-Free Type II Superconductors
The magnetization curve of a type II superconductor in general is hysteretic even when the vortices exhibit no volume or surface pinning. This geometric irreversibility, caused by an edge barrier for…
Ernst Helmut BrandtApr 14, 1999
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cond-mat/9806011
This paper has been withdrawn by the authors.
Brahim Elattari, Rochus KlesseApr 14, 1999
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Minimal Potentials with Very Many Minima
We demonstrate, by construction, that simple renormalizable matrix potentials with SN, as opposed to O(N), symmetry can exhibit an exponentially large number of inequivalent deep local minima.
Marin Soljacic, Frank WilczekApr 13, 1999
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Exact solution for two interacting electrons on artificial atoms and molecules in solids
We present a general scheme for finding the exact eigenstates of two electrons, with on-site repulsive potentials Ui, on I impurities in a macroscopic crystal. The model describes impurities in…
A. Aharony, O. Entin-Wohlman, Y. ImryApr 13, 1999
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Step fluctuations and random walks
The probability distribution p(l) of an atom to return to a step at distance l from the detachment site, with a random walk in between, is exactly enumerated. In particular, we study the dependence…
M. Bisani, W. SelkeApr 13, 1999
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Functional Renormalization Description of the Roughening Transition
We reconsider the problem of the static thermal roughening of an elastic manifold at the critical dimension d=2 in a periodic potential, using a perturbative Functional Renormalization Group…
Anusha Hazareesing, Jean-Philippe BouchaudApr 13, 1999
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Josephson tunneling between weakly interacting Bose-Einstein condensates
Based on a tunneling Hamiltonian description, we calculate the Josephson, normal and interference currents between two Bose-Einstein condensates described by the Bogoliubov theory. The dominant…
F. Meier, W. ZwergerApr 12, 1999
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Ratchet potential for fluxons in Josephson-Junction arrays
We propose a simple configuration of a one-dimensional parallel array of Josephson junctions in which the pinning potential for trapped fluxons lacks inversion symmetry (ratchet potential). This…
Fernando Falo, Pedro J. Martinez, Juan J. Mazo et al.Apr 12, 1999
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Projected SO(5) Models
We construct a class of projected SO(5) models where the Gutzwiller constraint of no-double-occupancy is implemented exactly. We introduce the concept of projected SO(5) symmetry where all static…
Shou-Cheng Zhang, Jiang-Ping Hu, Enrico Arrigoni et al.Apr 10, 1999
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Phonon-induced spin relaxation of conduction electrons in aluminum
Spin-flip Eliashberg function αS2F and temperature-dependent spin relaxation time T1(T) are calculated for aluminum using realistic pseudopotentials. The spin-flip electron-phonon coupling…
Jaroslav Fabian, S. Das SarmaApr 9, 1999
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An exactly solvable many-body problem in one dimension
For N impenetrable particles in one dimension where only the nearest and next-to-nearest neighbours interact, we obtain the complete spectrum both on a line and on a circle. Further, we establish a…
Sudhir R. Jain, Avinash KhareApr 9, 1999
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Timesaving Double-Grid Method for Real-Space Electronic-Structure Calculations
We present a simple and efficient technique in ab initio electronic-structure calculation utilizing real-space double-grid with a high density of grid points in the vicinity of nuclei. This technique…
Tomoya Ono, Kikuji HiroseApr 8, 1999
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Travelling waves in a drifting flux lattice
Starting from the time-dependent Ginzburg-Landau (TDGL) equations for a type II superconductor, we derive the equations of motion for the displacement field of a moving vortex lattice without inertia…
R. Aditi Simha, Sriram RamaswamyApr 8, 1999
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