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Condensed Matter papers — page 260

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Some New Results on Complex-Temperature Singularities in Potts Models on the Square Lattice
We report some new results on the complex-temperature (CT) singularities of q-state Potts models on the square lattice. We concentrate on the problematic region Re(a) < 0 (where a=eK) in which…
Victor Matveev, Robert ShrockMay 28, 1996
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Voltage rectification by a SQUID ratchet
We argue that the phase across an asymmetric dc SQUID threaded by a magnetic flux can experience an effective ratchet (periodic and asymmetric) potential. Under an external ac current, a rocking…
Ivar Zapata, Roland Bartussek, Fernando Sols et al.May 28, 1996
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Renormalized field theory and particle density profile in driven diffusive systems with open boundaries
We investigate the density profile in a driven diffusive system caused by a plane particle source perpendicular to the driving force. Focussing on the case of critical bulk density c we use a…
H. K. Janssen, K. OerdingMay 28, 1996
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Ernst Ising - physicist and teacher
The Ising model is one of the standard models in statistical physics. Since 1969 more than 12000 publications appeared using this model. In 1996 Ernst Ising celebrated his 96th birthday. Some…
S. KobeMay 28, 1996
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Hall Voltage Fluctuations as a Diagnostic of Internal Magnetic Field Fluctuations in High Temperature Superconductors and the Half-filled Landau Level
Fluctuations of the Hall voltage reveal information about long wavelength magnetic field fluctuations. If gauge theories of strongly correlated electrons are correct, such fluctuations are…
L. B. Ioffe, G. B. Lesovik, A. J. MillisMay 28, 1996
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Non Linear Current Response of a Many-Level Tunneling System: Higher Harmonics Generation
The fully nonlinear response of a many-level tunneling system to a strong alternating field of high frequency ω is studied in terms of the Schwinger-Keldysh nonequilibrium Green functions. The…
Y. Goldin, Y. AvishaiMay 28, 1996
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Collective excitations of atomic Bose-Einstein condensates
We apply linear-response analysis of the Gross-Pitaevskii equation to obtain the excitation frequencies of a Bose-Einstein condensate confined in a time-averaged orbiting potential trap. Our…
Mark Edwards, P. A. Ruprecht, K. Burnett et al.May 28, 1996
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Equation of State of the Hard-Sphere Crystal
A new approach to the averaged two-particle distribution function of a crystalline phase is presented. It includes an indirect check of the merit of the Gaussian approximation for the local density…
C. Rascon, L. Mederos, G. NavascuesMay 27, 1996
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Plasmon-pole approximation for semiconductor quantum wire electrons
We develop the plasmon-pole approximation for an interacting electron gas confined in a semiconductor quantum wire. We argue that the plasmon-pole approximation becomes a more accurate approach in…
S. Das Sarma, E. H. Hwang, Lian ZhengMay 27, 1996
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Crossover from directed percolation to compact directed percolation
We study critical spreading in a surface-modified directed percolation model in which the left- and right-most sites have different occupation probabilities than in the bulk. As we vary the…
J. F. F. Mendes, R. Dickman, H. HerrmannMay 27, 1996
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Excitonic instability and electric-field-induced phase transition towards a two dimensional exciton condensate
We present an InAs-GaSb-based system in which the electric-field tunability of its 2D energy gap implies a transition towards a thermodynamically stable excitonic condensed phase. Detailed…
Y. Naveh, B. LaikhtmanMay 27, 1996
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Dynamical Localization and Absolute Negative Conductance in an ac driven double quantum well
We analyze the I-V characteristic of a double quantum well integrated in an antenna and driven by THz radiation.We propose a microscopic model to calculate the sequential current including…
Ramon Aguado, Gloria PlateroMay 27, 1996
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Influence of electron-phonon interaction on superexchange
We investigate the influence of electron-phonon coupling on the superexchange interaction of magnetic insulators. Both the Holstein-Hubbard model where the phonons couple to the electron density, as…
W. Stephan, M. Capone, M. Grilli et al.May 27, 1996
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Dynamics of heteropolymers in dilute solution: effective equation of motion and relaxation spectrum
The dynamics of a heteropolymer chain in solution is studied in the limit of long chain length. Using functional integral representation we derive an effective equation of motion, in which the…
Jiunn-Ren Roan, E. I. ShakhnovichMay 27, 1996
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The A+B -> 0 annihilation reaction in a quenched random velocity field
Using field-theoretic renormalization group methods the long-time behaviour of the A+B -> 0 annihilation reaction with equal initial densities nA(0) = nB(0) = n0 in a quenched random velocity…
K. OerdingMay 26, 1996
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η-superconductivity in the one-dimensionnal pair hopping model
Using exact Lanczos diagonalizations we have shown that the pair-hopping model for negative W exhibits a phase transition into η- superconducting state. The transition occurs at …
Georges Bouzerar, G. I. JaparidzeMay 26, 1996
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A Population Genetic Approach to the Quasispecies Model
A population genetics formulation of Eigen's molecular quasispecies model is proposed and several simple replication landscapes are investigated analytically. Our results show a remarcable…
Domingos Alves, Jose Fernando FontanariMay 24, 1996
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Single hole dispersion relation for the real CuO2 plane
Dispersion relation for the CuO2 hole is calculated basing on the generalized t-t-J model, recently derived from the three-band one. Numerical ranges for all model parameters,…
V. I. Belinicher, A. L. Chernyshev, V. A. ShubinMay 24, 1996
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Theory of phase-locking in generalized hybrid Josephson junction arrays
A recently proposed scheme for the analytical treatment of the dynamics of two-dimensional hybrid Josephson junction arrays is extended to a class of generalized hybrid arrays with…
Michael Basler, Wolfram Krech, Konstantin Yu. PlatovMay 24, 1996
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Beyond the Mean Field Approximation for Spin Glasses
We study the d-dimensional random Ising model using a Bethe-Peierls approximation in the framework of the replica method. We take into account the correct interaction only inside replicated clusters…
M. Serva, G. PaladinMay 24, 1996
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Cellular automata models of traffic flow along a highway containing a junction
We examine various realistic generalizations of the basic cellular automaton model describing traffic flow along a highway. In particular, we introduce a slow-to-start rule which simulates a…
Simon C. Benjamin, Neil F. Johnson, P. M. HuiMay 24, 1996
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Ferromagnetism in the Hubbard model with an infinite-range hopping
We prove, as recently conjectured, that the ground state of the Hubbard Hamiltonian with an infinite-range hopping, when the number of electrons Ne=N+1 (N being the number of sites), is…
P. PieriMay 24, 1996
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Generalized t-t-J model: parameters and single-particle spectrum for electrons and holes in copper oxides
A microscopically based Hamiltonian of the generalized t-t-J model is presented. Two types of the additional t-terms are discussed. The set of ranges of the additional…
V. I. Belinicher, A. L. Chernyshev, V. A. ShubinMay 24, 1996
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Optical conductivity of strongly correlated electron systems
We present an exact diagonalization study of the frequency and wave vector dependent conductivity σ(q,ω) in small clusters of 2D t-J model. Unlike the related dynamical density correlation…
R. Eder, P. Wrobel, Y. OhtaMay 23, 1996
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Some exact analytic results for the linear and non-linear response of atoms in a trap with a model interaction
We present an exact expression for the evolution of the wavefunction of N interacting atoms in an arbitrarily time-dependent, d-dimensional parabolic trap potential ω(t). The interaction…
Simon C. Benjamin, Neil F. Johnson, Luis QuirogaMay 23, 1996
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