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Condensed Matter papers — page 265

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Impurity Effect on Spin Ladder System
Effects of nonmagnetic impurity doping in a spin ladder system with a spin gap are investigated by the exact diagonalization as well as by the variational Monte Carlo calculations. Substantial…
Yukitoshi Motome, Nobuyuki Katoh, Nobuo Furukawa et al.May 8, 1996
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Correlations of Nearby Levels Induced by a Random Potential
We consider a Hamiltonian H which is the sum of a deterministic part H0 and of a random potential V. For finite N × N matrices, following a method introduced by Kazakov, we derive a…
E. Brézin, S. HikamiMay 8, 1996
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Local Density of States in a Dirty Normal Metal connected to a Superconductor
A superconductor in contact with a normal metal not only induces superconducting correlations, known as proximity effect, but also modifies the density of states at some distance from the interface.…
W. Belzig, C. Bruder, Gerd SchoenMay 7, 1996
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Structural Relaxations in a Simple Model Molten Salt
The structural relaxations of a dense, binary mixture of charged hard spheres are studied using the Mode Coupling Theory (MCT). Qualitative differences to non--ionic systems are shown to result from…
Matthias FuchsMay 7, 1996
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Effect of diffusive boundaries on surface superconductivity in unconventional superconductors
Boundary conditions for a superconducting order parameter at a diffusive scattering boundary are derived from microscopic theory. The results indicate that for all but isotropic gap functions the…
D. F. Agterberg, M. B. WalkerMay 7, 1996
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Stability of Spatio-Temporal Structures in a Lattice Model of Pulse-Coupled Oscillators
We analyze the collective behavior of a lattice model of pulse-coupled oscillators. By studying the intrinsic dynamics of each member of the population and their mutual interactions we observe the…
A. Diaz-Guilera, Alex Arenas, A. Corral et al.May 7, 1996
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Electronic Hamiltonian for Transition Metal Oxide Compounds
An effective electronic Hamiltonian for transition metal oxide compounds is presented. For Mn-oxides, the Hamiltonian contains spin-2 ``spins'' and spin-3/2 ``holes'' as degrees of…
Erwin Müller-Hartmann, Elbio DagottoMay 7, 1996
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On the large order behaviour of the Potts model
Following the work by Houghton, Reeve and Wallace about an alternative formulation of the n 0 limit of the (n+1) state Potts model in field theory for the large order behaviour of the…
Domenico M. CarlucciMay 7, 1996
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Kinetics and Jamming Coverage in a Random Sequential Adsorption of Polymer Chains
Using a highly efficient Monte Carlo algorithm, we are able to study the growth of coverage in a random sequential adsorption (RSA) of self-avoiding walk (SAW) chains for up to 1012 time steps on…
Jian-Sheng Wang, Ras B. PandeyMay 7, 1996
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Nonequilibrium Phase Transition and Self-Organized Criticality in a Sandpile Model with Stochastic Dynamics
We introduce and study numerically a directed two-dimensional sandpile automaton with probabilistic toppling (probability parameter p) which provides a good laboratory to study both self-organized…
S. Luebeck, B. Tadic, K. D. UsadelMay 7, 1996
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Bernoulli effect in superconductors and Cooper-pair mass spectroscopy
Recently Mishonov (Phys. Rev. B 50, 4009 (1994)) suggested to measure the Cooper-pair effective mass using current-induced contact potential difference in superconductors. In this Comment it is…
M. V. SimkinMay 7, 1996
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Snakes and Ladders
We map spin ladders with nl legs and couplings J' across all rungs and J(1 γ) along the legs, staggered in both directions, to a sigma model. Setting its θ= (2m+1)π (where it is…
M. A. Martin-Delgado, R. Shankar, G. SierraMay 6, 1996
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On the Particles Transport Between Embedded Clusters
Diffusional interactions within the Ostwald Ripening process are analyzed in the present paper. An off-centre diffusion approach \/ is performed to point out the direct correlation between the…
F. Despa, V. TopaMay 6, 1996
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Distribution of transmitted charge through a double-barrier junction
The distribution function of transmitted charge through a double-barrier junction is studied at zero temperature and at small applied voltage. Both a semiclassical model, in which the transport is…
M. J. M. de JongMay 6, 1996
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Coupling of Surface Acoustic Waves to a Two Dimensional Electron Gas
When a surface acoustic wave (SAW) is coupled piezoelectrically to a two dimensional electron gas (2DEG), a velocity shift and attenuation of the SAW are induced that reflect the conductivity of the…
Steven H. SimonMay 6, 1996
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The low-temperature phase of Kac-Ising models
We analyse the low temperature phase of ferromagnetic Kac-Ising models in dimensions d≥ 2. We show that if the range of interactions is -1, then two disjoint translation invariant Gibbs…
Anton Bovier, Milos ZahradnikMay 6, 1996
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Collective Excitations in Realistic Quantum Wires
We have used the Hartree-Fock Random Phase Approximation (HF-RPA) to study the interacting electron gas in a quantum wire. The spectra of intersubband spin-flip excitations reveal a considerable red…
Arne Brataas, A. G. Mal'shukov, Vidar Gudmundsson et al.May 6, 1996
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The group Γ(2) and the fractional quantum hall effect
We analyze the action of the inhomogeneous modular group Γ(2) on the three cusps of its principal fundamental domain in the Poincare half plane. From this, we obtain an exhaustive classification of…
Y. Georgelin, J. C. WalletMay 6, 1996
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Mesoscopic Fluctuations of Elastic Cotunneling
We study mesoscopic fluctuations of the conductance through a quantum dot at the wings of the Coulomb blokade peaks. At low temperatures, the main mechanism of conduction is the elastic cotunneling.…
I. L. Aleiner, L. I. GlazmanMay 6, 1996
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A study of one dimensional correlated disordered systems using invariant measure method
The behavior of electronic states of one dimensional correlated disordered systems which are modelled by a tight binding Hamiltonian is studied analytically using the invariant measure method. The…
K. Kundu, D. Giri, K. RayMay 5, 1996
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Behavior of magnetic impurities in gapless Fermi systems
In a number of systems, including certain semiconductors and unconventional superconductors, the effective density of states varies near the Fermi energy like |E-EF|r. The behavior of dilute…
Kevin IngersentMay 3, 1996
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Magnetic properties of NaV2O5, a one-dimensional spin 1/2 antiferromagnet with finite chains
We have performed measurements of the magnetic susceptibility of NaV2O5 between 2 and 400 K. The high temperature part is typical of spin 1/2 chains with a nearest--neighbour antiferromagnetic…
Frederic Mila, Patrice Millet, Jacques BonvoisinMay 3, 1996
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Re-entrance of the metallic conductance in a mesoscopic proximity superconductor
We present an experimental study of the diffusive transport in a normal metal near a superconducting interface, showing the re-entrance of the metallic conductance at very low temperature. This new…
P. Charlat, H. Courtois, Ph. Gandit et al.May 3, 1996
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Monopoles in the gauge theory of the t-J model
We consider a RG approach for the plasma of magnetic monopoles of the Ioffe-Larkin approach to the t-J model. We first derive the interaction parameters of the 2+1 plasma of magnetic monopoles. The…
R. Melin, B. Doucot, CRTBT et al.May 3, 1996
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Magnetic-field and chemical-potential effects on the low-energy separation
We show that in the presence of a magnetic field the usual low-energy separation of the Hubbard chain is replaced by a ``c'' and ``s'' separation. Here c and s refer to…
J. M. P. Carmelo, A. H. Castro NetoMay 3, 1996
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