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Condensed Matter papers — page 215

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Non-Hermitean Random Matrix Theory: method of hermitization
We consider random non-hermitean matrices in the large N limit. The power of analytic function theory cannot be brought to bear directly to analyze non-hermitean random matrices, in contrast to…
J. Feinberg, A. ZeeMar 10, 1997
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Chaos in a Two-Dimensional Ising Spin Glass
We study chaos in a two dimensional Ising spin glass by finite temperature Monte Carlo simulations. We are able to detect chaos with respect to temperature changes as well as chaos with respect to…
Muriel Ney-Nifle, A. Peter YoungMar 7, 1997
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Power Markets for Controlling Smart Matter
Embedding microscopic sensors, computers and actuators into materials allows physical systems to actively monitor and respond to their environments. This leads to the possibility of creating smart…
Oliver Guenther, Tad Hogg, Bernardo A. HubermanMar 7, 1997
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Quantum Nucleation in a Ferromagnetic Film Placed in a Magnetic Field at an Arbitrary Angle
We study the quantum nucleation in a thin ferromagnetic film placed in a magnetic field at an arbitrary angle. The dependence of the quantum nucleation and the temperature of the crossover from…
Gwang-Hee KimMar 7, 1997
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Electron-Photon interaction in resonant tunneling diodes
We develope a model to describe the transmission coefficient and tunneling current in the presence of photon-electron coupling in a resonant diode. Our model takes into account multiphoton processes…
Jesus Inarrea, Ramon Aguado, Gloria PlateroMar 6, 1997
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Asymptotic results on the product of random probability matrices
I study the product of independent identically distributed D× D random probability matrices. Some exact asymptotic results are obtained. I find that both the left and the right products…
X. R. WangMar 6, 1997
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Negative Magnetoresistance in the Nearest-neighbor Hopping Conduction
We propose a size effect which leads to the negative magnetoresistance in granular metal-insulator materials in which the hopping between two nearest neighbor clusters is the main transport…
X. R. Wang, X. C. XieMar 6, 1997
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AC Dynamics and Metastability of a Flux-Line Lattice
We have measured the complex surface impedance of 2H-NbSe2 in the mixed state over a wide range of magnetic field(0-2T) and frequency(10-3000MHz). A crossover between pinned and viscous dynamics of…
W. Henderson, E. Y. Andrei, M. J. Higgins et al.Mar 5, 1997
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Lacunarity of Random Fractals
We discuss properties of random fractals by means of a set of numbers that characterize their universal properties. This set is the generalized singularity specturm that consists of the usual…
Francisco J. Solis, Louis TaoMar 5, 1997
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Dissipative Dynamics of Solitons in Planar Ferromagnets
Dynamics of magnetic bubbles in planar ferromagnets described by the Landau-Lifshitz equation with dissipation is analyzed. The pure O(3) sigma model has static multisoliton solutions, characterized…
Jacek DziarmagaMar 4, 1997
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Polaron band formation in the Holstein model
We present numerical exact results for the polaronic band structure of the Holstein molecular crystal model in one and two dimensions. The use of direct Lanczos diagonalization technique, preserving…
G. Wellein, H. FehskeMar 4, 1997
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Effects of Electron Correlations on Hofstadter Spectrum
By allowing interactions between electrons, a new Harper's equation is derived to examine the effects of electron correlations on the Hofstadter energy spectra. It is shown that the structure of…
Hyeonjin Doh, Seung-Pyo Hong, Sung-Ho Suck SalkMar 4, 1997
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Quasi 1 and 2d Dilute Bose Gas in Magnetic Traps : Existence of Off-Diagonal Order and Anomalous Quantum Fluctuations
Current magnetic traps can be made so anisotropic that the atomic gas trapped inside behaves like quasi one or two dimensional system. Unlike the homogeneous case, quantum phase fluctuations do not…
Tin-Lun Ho, Michael MaMar 3, 1997
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Random hermitian matrices in an external field
In this article, a model of random hermitian matrices is considered, in which the measure (-S) contains a general U(N)-invariant potential and an external source term: S=N(V(M)+MA). The…
P. Zinn-JustinMar 3, 1997
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In-plane optical response of Bi2Sr2CuO6
We report on infrared reflectivity measurements of the ab-plane response of superconducting Bi2Sr2CuO6 single crystals. The frequency dependent conductivity has a maximum near 700…
A. A. Tsvetkov, J. Schuetzmann, D. van der MarelMar 3, 1997
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On-line learning of non-monotonic rules by simple perceptron
We study the generalization ability of a simple perceptron which learns unlearnable rules. The rules are presented by a teacher perceptron with a non-monotonic transfer function. The student is…
Jun-ichi Inoue, Hidetoshi Nishimori, Yoshiyuki KabashimaMar 3, 1997
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On-Line AdaTron Learning of Unlearnable Rules
We study the on-line AdaTron learning of linearly non-separable rules by a simple perceptron. Training examples are provided by a perceptron with a non-monotonic transfer function which reduces to…
Jun-ichi Inoue, Hidetoshi NishimoriMar 3, 1997
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Stochastic Multiresonance
We present a class of systems for which the signal-to-noise ratio as a function of the noise level may display a multiplicity of maxima. This phenomenon, referred to as stochastic multiresonance,…
J. M. G. Vilar, J. M. RubíMar 2, 1997
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Effect of the Output of the System in Signal Detection
We analyze the consequences that the choice of the output of the system has in the efficiency of signal detection. It is shown that the signal and the signal-to-noise ratio (SNR), used to…
J. M. G. Vilar, J. M. RubíMar 2, 1997
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Critical behavior and the Neel temperature of quantum quasi-two-dimensional Heisenberg antiferromagnets
The nonlinear sigma-model and its generalization on N-component spins, the O(N) model, are considered to describe thermodynamics of a quantum quasi-two-dimensional (quasi-2D) Heisenberg…
V. Yu. Irkhin, A. A. KataninMar 2, 1997
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1/N Expansion for Critical Exponents of Magnetic Phase Transitions in CPN-1 Model at 2<d<4
Critical exponents in the CPN-1 model, which describes localized-moment ferro- and antiferromagnets (N=2 in the Heisenberg model), are calculated from two-particle Green's functions to first…
V. Yu. Irkhin, A. A. Katanin, M. I. KatsnelsonMar 2, 1997
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On the Self-Consistent Spin-Wave Theory of Two-Dimensional Magnets With Impurities
The self-consistent spin-wave theory is applied to investigate the magnetization distribution around the impurity in isotropic and easy-axis two-dimensional ferro- and antiferromagents. The…
V. Yu. Irkhin, A. A. Katanin, M. I. KatsnelsonMar 2, 1997
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Accuracy of Electronic Wave Functions in Quantum Monte Carlo: the Effect of High-Order Correlations
Compact and accurate wave functions can be constructed by quantum Monte Carlo methods. Typically, these wave functions consist of a sum of a small number of Slater determinants multiplied by a…
Chien-Jung Huang, C. J. Umrigar, M. P. NightingaleMar 2, 1997
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High temperature anomaly of the conductance of a tunnel junction
The linear conductance of a tunnel junction in series with an ohmic resistor is determined in the high temperature limit. The tunneling current is treated nonperturbatively by means of path integral…
Georg Goeppert, Xiaohui Wang, Hermann GrabertFeb 27, 1997
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Comment on "Quantum Phase Slips and Transport in Ultrathin Superconducting Wires"
In a recent Letter (Phys. Rev. Lett.78, 1552 (1997) ), Zaikin, Golubev, van Otterlo, and Zimanyi criticized the phenomenological time-dependent Ginzburg-Laudau model which I used to study the quantum…
Ji-Min DuanFeb 26, 1997
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