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Condensed Matter papers — page 256

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The Fermion Chern-Simons Gauge Theory of Fractional Quantum Hall Effect for Electromagnetic Polarization Tensor
Unlike an earlier theory, by avoiding both the electromagnetic gauge field shift and the assumption of the zero average of electromagnetic field fluctuation the fermion Chern-Simons gauge theory is…
Tae-Hyoung Gimm, Sung-Ho Suck SalkJun 11, 1996
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Complete Wiener-Hopf Solution of the X-Ray Edge Problem
We present a complete solution of the soft x-ray edge problem within a field-theoretic approach based on the Wiener-Hopf infinite-time technique. We derive for the first time within this approach…
V. JanisJun 11, 1996
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Mesoscopic Effects in the Fractional Quantum Hall Regime: Chiral Luttinger versus Fermi Liquid
We study tunneling through an edge state formed around an antidot in the fractional quantum Hall regime using Wen's chiral Luttinger liquid theory extended to include mesoscopic effects. We…
Michael R. Geller, Daniel Loss, George KirczenowJun 11, 1996
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Spatial organization in cyclic Lotka-Volterra systems
We study the evolution of a system of N interacting species which mimics the dynamics of a cyclic food chain. On a one-dimensional lattice with N<5 species, spatial inhomogeneities develop…
L. Frachebourg, P. L. Krapivsky, E. Ben-NaimJun 11, 1996
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Josephson Effect in Unconventional Superconductors
In this letter we present a simple relation, that allows one to predict the Josephson current between two unconventional superconductors with arbitrary band-structure and pairing symmetry. We…
Supriyo Datta, Manoj P. SamantaJun 10, 1996
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Two-spinon dynamic structure factor of the one-dimensional S=1/2 Heisenberg antiferromagnet
The exact expression derived by Bougourzi, Couture, and Kacir for the 2-spinon contribution to the dynamic spin structure factor Szz(q,ω) of he one-dimensional S=1/2 Heisenberg antiferromagnet…
Michael Karbach, Gerhard Müller, A. Hamid BougourziJun 10, 1996
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Shape Phase Transition of Polyampholytes in Two Dimensions
We have studied the transition in shape of two dimensional polyampholytes using Monte Carlo simulation. We observe that polymers with randomly charged monomers get into a globular shape at lower…
M. R. Ejtehadi, S. RouhaniJun 10, 1996
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The Surface Region of Superfluid 4He as a Dilute Bose-Condensed Gas
In the low-density surface region of superfluid 4He, the atoms are far apart and collisions can be ignored. The only effect of the interactions is from the long-range attractive Hartree potential…
A. Griffin, S. StringariJun 10, 1996
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Avalanches, Scaling and Coherent Noise
We present a simple model of a dynamical system driven by externally-imposed coherent noise. Although the system never becomes critical in the sense of possessing spatial correlations of arbitrarily…
M. E. J. Newman, Kim SneppenJun 10, 1996
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Momentum-Dependent Charge Transfer Excitations in Sr2CuO2Cl2 - Angle Resolved Electron Energy Loss Spectroscopy
Electron-hole pair excitations in the insulating cuprates Sr2CuO2Cl2 were investigated by angle-resolved electron energy loss spectroscopy. The optically allowed and optically forbidden…
Y. Y. Wang, F. C. Zhang, V. P. Dravid et al.Jun 10, 1996
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Bosonization in the two-channel Kondo model
The bosonization of the S=1/2 anisotropic two-channel Kondo model is shown to yield two equivalent representations of the original problem. In a straight forward extension of the Emery-Kivelson…
A. J. SchofieldJun 10, 1996
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Phase of Aharonov-Bohm oscillations in conductance of mesoscopic systems
Motivated by a recent experiment we analyze in detail the phase of Aharonov-Bohm oscillations across a 1D ring with a stub coupled to one of its arms, in the presence of a magnetic flux. We…
P. Singha Deo, A. M. JayannavarJun 10, 1996
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Neutron Compton Scattering
Neutron Compton scattering measurements have the potential to provide direct information about atomic momentum distributions and adiabatic energy surfaces in condensed matter. First applied to…
Greg WatsonJun 10, 1996
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Glassy behaviour in disordered systems with non-relaxational dynamics
We show that a family of disordered systems with non-relaxational dynamics may exhibit ``glassy'' behavior at nonzero temperature, although such a behavior appears to be ruled out by a…
Leticia F. Cugliandolo, Jorge Kurchan, Pierre Le Doussal et al.Jun 10, 1996
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Surprises in the Orbital Magnetic Moment and g-Factor of the Dynamic Jahn-Teller Ion C60-
We calculate the magnetic susceptibility and g-factor of the isolated C60- ion at zero temperature, with a proper treatment of the dynamical Jahn-Teller effect, and of the associated orbital…
Erio Tosatti, Nicola Manini, Olle GunnarssonJun 10, 1996
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Surface Magnetisation and Surface Correlations in Aperiodic Ising Models
We consider the surface critical behaviour of diagonally layered Ising models on the square lattice where the inter-layer couplings follow some aperiodic sequence. The surface magnetisation is…
Ferenc Igloi, Peter LajkoJun 10, 1996
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Interface Fluctuations on a Hierarchical Lattice
We consider interface fluctuations on a two-dimensional layered lattice where the couplings follow a hierarchical sequence. This problem is equivalent to the diffusion process of a quantum particle…
Ferenc Igloi, Ferenc SzalmaJun 10, 1996
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Dynamics in the dimerised and high field incommensurate phase of CuGeO3
Temperature (2.3<T<40\ K) and magnetic field (0<B<17\ T) dependent far infrared absorption spectroscopy on the spin-Peierls coumpound CuGeO3\ has revealed several new absorption processes in…
P. H. M. van Loosdrecht, S. Huant, G. Martinez et al.Jun 10, 1996
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The Ngai model of relaxation: An alternative for the study of an interacting system of small particles
It is shown that the Ngai model of relaxation accounts for the main experimental results of the magnetic relaxation in an assembly of interacting fine particles.
J. CastroJun 10, 1996
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Random Walks through the Ensemble: Linking Spectral Statistics with Wavefunction Correlations in Disordered Metals
We use a random walk in the ensemble of impurity configurations to generate a Brownian motion model for energy levels in disordered conductors. Treating arc-length along the random walk as fictitous…
J. T. Chalker, Igor V. Lerner, Robert A. SmithJun 10, 1996
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Matrix-Product States for a One-Dimensional Lattice Gas with Parallel Dynamics
The hopping motion of classical particles on a chain coupled to reservoirs at both ends is studied for parallel dynamics with arbitrary probabilities. The stationary state is obtained in the form of…
A. Honecker, I. PeschelJun 10, 1996
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Equilibrium and off-equilibrium simulations of the 4d Gaussian spin glass
In this paper we study the on and off-equilibrium properties of the four dimensional Gaussian spin glass. In the static case we determine with more precision that in previous simulations both the…
Giorgio Parisi, Federico Ricci-Tersenghi, Juan J. Ruiz-LorenzoJun 9, 1996
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NiO Exchange Bias Layers Grown by Direct Ion Beam Sputtering of a Nickel Oxide Target
A new process for fabricating NiO exchange bias layers has been developed. The process involves the direct ion beam sputtering (IBS) of a NiO target. The process is simpler than other deposition…
Richard P. Michel, A. Chaiken, Young K. Kim et al.Jun 9, 1996
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On the 3n+l Quantum Number in the Cluster Problem
It has recently been suggested that an exactly solvable problem characterized by a new quantum number may underlie the electronic shell structure observed in the mass spectra of medium-sized sodium…
Erik KochJun 8, 1996
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Interacting Arrays of Steps and Lines in Random Media
The phase diagram of two interacting planar arrays of directed lines in random media is obtained by a renormalization group analysis. The results are discussed in the contexts of the roughening of…
J. Kierfeld, T. HwaJun 8, 1996
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