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Condensed Matter papers — page 259

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Intrinsic and extrinsic vortex nucleation mechanisms in the flow
We propose very general vortex nucleation mechanisms analogous to a hydrodynamic instability and calculate associated critical velocity in agreement with experiments. The creation of vortices via…
F. V. KusmartsevJun 1, 1996
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Effective charge-spin models for quantum dots
It is shown that at low densities, quantum dots with few electrons may be mapped onto effective charge-spin models for the low-energy eigenstates. This is justified by defining a lattice model based…
John H. Jefferson, Wolfgang HäuslerJun 1, 1996
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Grafted Rods: A Tilting Phase Transition
A tilting phase transition is predicted for systems comprising rod like molecules which are irreversibly grafted to a flat surface, so that the non interacting rods are perpendicularly oriented. The…
F. Schmid, D. Johannsmann, A. HalperinMay 31, 1996
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Hole pairing and phonon dynamics in generalized 2D t-J-Holstein models
The formation of hole pairs in the planar t-J model is studied in the presence of independent dynamic vibrations of the in-plane oxygen atoms. In-plane (breathing modes) and out-of-plane…
T. Sakai, D. Poilblanc, D. J. ScalapinoMay 31, 1996
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Spectral Flow, Magnus Force and Mutual Friction via the Geometric Optics Limit of Andreev Reflection
The notion of spectral flow has given new insight into the motion of vortices in superfluids and superconductors. For a BCS superconductor the spectrum of low energy vortex core states is largely…
Michael StoneMay 31, 1996
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c axis superfluid response of Copper-Oxide superconductors
A novel interplay between d-wave superconducting order parameter symmetry and the underlying Cu 3d orbital based electronic structure of Copper-Oxides leads to a striking anisotropy in the superfluid…
T. Xiang, J. M. WheatleyMay 31, 1996
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Finite size effects in Derrida's model multicriticities and limits of generalization for the Zamolodchikov' s C-theorem
Finite size effects in the multicriticity point and boundaries between phases are calculated. There are anomalous large finite size effects on the boundary of ferromagnetic phase with paramagnetic or…
Y. B. SaakianMay 31, 1996
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Theoretical Approach to the Correlations of a Hard-Sphere Crystal
We present the first theoretical approach to the angular-average of the two-body correlation function g(r) for simple solids. It is based on three sum rules for g(r): the…
C. Rascon, L. Mederos, G. NavascuesMay 31, 1996
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d-wave superconductivity near charge instabilities
We investigate the symmetry of the superconducting order parameter in the proximity of a phase-separation or of an incommensurate charge-density-wave instability. The attractive effective interaction…
A. Perali, C. Castellani, C. Di Castro et al.May 31, 1996
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Voltage-biased quantum wire with impurities
The bosonization technique to describe correlated electrons in a one-dimensional quantum wire containing impurities is extended to include an applied voltage source. The external reservoirs are shown…
Reinhold Egger, Hermann GrabertMay 31, 1996
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Fine structure of excitons in Cu2O
Three experimental observations on 1s-excitons in Cu2O are not consistent with the picture of the exciton as a simple hydrogenic bound state: the energies of the 1s-excitons deviate from the…
G. M. Kavoulakis, Yia-Chung Chang, Gordon BaymMay 31, 1996
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Shadow features and shadow bands in the paramagnetic state of cuprate superconductors
The conditions for the precursors of antiferromagnetic bands in cuprate superconductors are studied using weak-to-intermediate coupling approach. It is shown that there are, in fact, three different…
Y. M. VilkMay 30, 1996
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Persistent currents in interacting electronic systems
Persistent currents in disordered mesoscopic rings threaded by a magnetic flux are calculated using exact diagonalization methods in the one-dimensional (1D) case and self-consistent Hartree-Fock…
Georges Bouzerar, Didier PoilblancMay 30, 1996
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Coupling to optical phonons in the one-dimensional t-J model: Effects on superconducting fluctuations and phase separation
The one-dimensional (1D) t-J Holstein model is studied by exact diagonalization of finite rings using a variational approximation for the phonon states. Due to renormalization effects induced by…
Roland FehrenbacherMay 30, 1996
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Binary friction tensor for Brownian particles : overcoming spurious finite-size effects
Starting from a careful analysis of the coupled Langevin equations for two interacting Brownian particles, we derive a method for extracting the binary friction tensor from the correlation function…
Lydéric Bocquet, Jean-Pierre Hansen, Jaroslaw PiaseckiMay 30, 1996
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High friction limit of the Kramers equation : the multiple time-scale approach
The purpose of the paper is to give a pedagogical introduction to the multiple time-scale technique, on the example of the high friction limit of the Kramers equation. We begin with a discussion of…
Lydéric BocquetMay 30, 1996
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Critical fluctuations in superconductors and the magnetic field penetration depth
The superconducting transition is studied within the one-loop renormalization group in fixed dimension D=3 and at the critical point. A tricritical behavior is found, and for κ> κc, an…
Igor F. Herbut, Zlatko TesanovicMay 30, 1996
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Electrostriction of Polar Glasses
We develop a finite temperature theory for the susceptibility and electrostriction of isotropic substances in which permanent electric dipoles are restrained from free rotation by elastic forces. All…
J. I. Katz, David R. NelsonMay 29, 1996
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The Supersymmetric t-J Model with a Boundary
An open supersymmetric t-J chain with boundary fields is studied by means of the Bethe Ansatz. Ground state properties for the case of an almost half-filled band and a bulk magnetic field are…
Fabian H. L. EsslerMay 29, 1996
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Microscopic Reversibility and Macroscopic Behavior: Physical Explanations and Mathematical Derivations
The observed general time-asymmetric behavior of macroscopic systems -- embodied in the second law of thermodynamics -- arises naturally from time-symmetric microscopic laws due to the great…
Joel L. LebowitzMay 29, 1996
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Quasiparticle energy dispersion in doped two dimensional quantum antiferromagnets
The quasiparticle dispersion in the one-hole t-t'-t"-J model is studied. Both the finite-size diagonalization and the self-consistent Born approximation calculations have been performed and…
T. Xiang, J. M. WheatleyMay 29, 1996
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Force-Extension Relation and Plateau Modulus for Wormlike Chains
We derive the linear force-extension relation for a wormlike chain of arbitrary stiffness including entropy elasticity, bending and thermodynamic buckling. From this we infer the plateau modulus…
Klaus Kroy, Erwin FreyMay 29, 1996
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Columnar dimer and plaquette resonating valence bond states of the quantum dimer model
We study the nature of the ground state of the quantum dimer model proposed by Rokhsar and Kivelson by diagonalizing the Hamiltonian of the model on square lattices of size L× L, where $L≤…
P. W. Leung, K. C. Chiu, K. J. RungeMay 29, 1996
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Perturbation study on the spin and charge susceptibilities of the two-dimensional Hubbard model
We investigate the spin and charge susceptibilities of the two-dimensional Hubbard model based upon the perturbative calculation in the strength of correlation U. For U comparable to a bare…
Takashi Hotta, Satoshi FujimotoMay 29, 1996
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Undulatory Variation of Antiferromagnetic Strength with Magnetic Field Based on Hubbard Model Hamiltonian
Using the Hubbard model Hamiltonian in a mean field level, we examine the variation of antiferromagnetic strength with applied magnetic field. It is demonstrated that minima in the antiferromagnetic…
Hyeonjin Doh, Sung-Ho Suck SalkMay 29, 1996
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