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Condensed Matter papers — page 266

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Hamiltonian approach to the transport properties of superconducting quantum point contacts
A microscopic theory of the transport properties of quantum point contacts giving a unified description of the normal conductor- superconductor (N-S) and superconductor-superconductor (S-S) cases is…
J. C. Cuevas, A. Martin-Rodero, A. Levy YeyatiMay 3, 1996
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Branching Processes and Evolution at the Ends of a Food Chain
In a critically self--organized model of punctuated equilibrium, boundaries determine peculiar scaling of the size distribution of evolutionary avalanches. This is derived by an inhomogeneous…
G. Caldarelli, C. Tebaldi, A. L. StellaMay 3, 1996
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Finite-temperature Fermi-edge singularity in tunneling studied using random telegraph signals
We show that random telegraph signals in metal-oxide-silicon transistors at millikelvin temperatures provide a powerful means of investigating tunneling between a two-dimensional electron gas and a…
D. H. Cobden, B. A. MuzykantskiiMay 3, 1996
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Computing the Roughening Transition of Ising and Solid-On-Solid Models by BCSOS Model Matching
We study the roughening transition of the dual of the 2D XY model, of the Discrete Gaussian model, of the Absolute Value Solid-On-Solid model and of the interface in an Ising model on a 3D simple…
M. Hasenbusch, K. PinnMay 3, 1996
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Anisotropic Interface Depinning - Numerical Results
We study numerically a stochastic differential equation describing an interface driven along the hard direction of an anisotropic random medium. The interface is subject to a homogeneous driving…
Heiko LeschhornMay 3, 1996
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Nonequilibrium orbital magnetization of strongly localized electrons
The magnetic response of strongly localized electrons to a time-dependent vector potential is considered. The orbital magnetic moment of the system, away from steady-state conditions, is obtained.…
Y. Galperin, O. Entin-WohlmanMay 3, 1996
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Mesoscopic Capacitors: A Statistical Analysis
The capacitance of mesoscopic samples depends on their geometry and physical properties, described in terms of characteristic times scales. The resulting ac admittance shows sample to sample…
Victor A. Gopar, Pier A. Mello, Markus ButtikerMay 2, 1996
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Magnetization of Mesoscopic Disordered Networks
We study the magnetic response of mesoscopic metallic isolated networks. We calculate the average and typical magnetizations in the diffusive regime for non-interacting electrons or in the first…
Michael Pascaud, Gilles MontambauxMay 2, 1996
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Quantum-Dot Cascade Laser: Proposal for an Ultra-Low-Threshold Semiconductor Laser
We propose a quantum-dot version of the quantum-well cascade laser of Faist et al. [Science 264, 553 (1994)]. The elimination of single phonon decays by the three-dimensional confinement…
Ned S. Wingreen, Charles A. StaffordMay 2, 1996
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Correlation of eigenstates in the critical regime of quantum Hall systems
We extend the multifractal analysis of the statistics of critical wave functions in quantum Hall systems by calculating numerically the correlations of local amplitudes corresponding to eigenstates…
Krystian Pracz, Martin Janssen, Peter FrecheMay 2, 1996
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The Moving Glass Phase of Dirty Type II Superconductors
We study numerically the motion of vortices in dirty type II superconductors. In two dimensions at strong driving currents, vortices form highly correlated ``static channels''. The static…
Kyungsun Moon, Richard T. Scalettar, Gergely T. ZimanyiMay 2, 1996
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Two-Channel Kondo Lattice: An Incoherent Metal
The two-channel Kondo lattice model is examined with a Quantum Monte Carlo simulation in the limit of infinite dimensions. We find non-fermi-liquid behavior at low temperatures including a finite…
Mark Jarrell, Hanbin Pang, D. L. Cox et al.May 1, 1996
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Nonequilibrium brittle fracture propagation: Steady state, oscillations and intermittency
A minimal model is constructed for two-dimensional fracture propagation. The heterogeneous process zone is presumed to suppress stress relaxation rate, leading to non-quasistatic behavior. Using the…
Raphael BlumenfeldMay 1, 1996
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What does d-wave symmetry tell us about the pairing mechanism?
In this paper we argue that d-wave symmetry is a general consequence of superconductivity driven by repulsive interactions. Van Hove (or flat band) effects, deriving from the two dimensionality of…
K. Levin, D. Z. Liu, Jiri MalyMay 1, 1996
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Dynamical Transition in Sliding Charge-density Waves with Quenched Disorder
We have studied numerically the dynamics of sliding charge-density waves (CDWs) in the presence of impurities in d=1,2. The model considered exhibits a first order dynamical transition at a critical…
Lee-Wen Chen, Leon Balents, Matthew P. A. Fisher et al.May 1, 1996
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Theory of Coherent Time-dependent Transport in One-dimensional Multiband Semiconductor Superlattices
We present an analytical study of one-dimensional semiconductor superlattices in external electric fields, which may be time-dependent. A number of general results for the (quasi)energies and…
Jon Rotvig, Antti-Pekka Jauho, Henrik SmithMay 1, 1996
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Calculated optical properties of Si, Ge, and GaAs under hydrostatic pressure
The macroscopic dielectric function in the random-phase-approximation without local field effect has been implemented using the local density approximation with an all electron, full-potential linear…
M. Alouani, J. M. WillsMay 1, 1996
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Rescaling Relations between Two- and Three-dimensional Local Porosity Distributions for Natural and Artificial Porous Media
Local porosity distributions for a three-dimensional porous medium and local porosity distributions for a two-dimensional plane-section through the medium are generally different. However, for…
B. Virgin, E. Haslund, R. HilferMay 1, 1996
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The Finite-U Impurity Anderson Model in the presence of an external magnetic field
We have investigated effects of an external magnetic field in the impurity Anderson model with a finite on-site Coulomb repulsion U. Large Nf expansion is employed in the slave boson…
Kicheon Kang, B. I. MinMay 1, 1996
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Tunneling through a barrier in Tomonaga-Luttinger liquid connected to reservoirs
The transport through a barrier is studied for a Tomonaga-Luttinger liquid of finite length connected to reservoirs. An effective action for the phase variable at the barrier is derived for spatially…
Akira Furusaki, Naoto NagaosaMay 1, 1996
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Fluctuation Effects And Order Parameter Symmetry In The Cuprate Superconductors
Effect of phase fluctuations on superconducting states with anisotropic order parameters is studied in a BCS like lattice model of cuprate superconductors. The degradation of the mean field…
Biplab Chattopadhyay, D. M. Gaitonde, A. TaraphderMay 1, 1996
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Variational Study of the Spin-Gap Phase of the One-Dimensional t-J Model
We propose a correlated spin-singlet-pairs wave function to describe the spin-gap phase of the one-dimensional t-J model at low density. Adding a Jastrow factor with a variational parameter, ν,…
Y. C. Chen, T. K. LeeMay 1, 1996
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Circular phase of a two dimensional ferromagnet with dipolar interactions
We make for the first time a large-scale Monte-Carlo simulation of a ferromagnetic Heisenberg model with dipolar interactions on a two dimensional square lattice with open boundaries using an…
Fumitaka Matsubara, Junya SasakiMay 1, 1996
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Fermi liquid theory: a renormalization group point of view
We show how Fermi liquid theory results can be systematically recovered using a renormalization group (RG) approach. Considering a two-dimensional system with a circular Fermi surface, we derive RG…
N. DupuisApr 30, 1996
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On the Decoupling of Layered Superconducting Films in Parallel Magnetic Field
The issue of the decoupling of extreme type-II superconducting thin films (λL→∞) with weakly Josephson-coupled layers in magnetic field parallel to the layers is considered via the…
J. P. RodriguezApr 30, 1996
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