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Condensed Matter papers — page 205

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Collective charge density wave motion through an ensemble of Aharonov-Bohm rings
We investigate theoretically the collective charge density wave motion through an ensemble of small disordered Aharonov-Bohm rings. It is shown that the magnetic flux modulates the threshold field…
M. I. Visscher, B. RejaeiJul 21, 1997
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High order amplitude equation for steps on creep curve
We consider a model proposed by one of the authors for a type of plastic instability found in creep experiments which reproduces a number of experimentally observed features. The model consists of…
Mulugeta Bekele, G. AnanthakrishnaJul 21, 1997
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Quantum relaxation in open chaotic systems
Using the supersymmetry technique, we analytically derive the recent result of Casati, Maspero and Shepelyansky [cond-mat/9706103] according to which the quantum dynamics of open chaotic systems…
Klaus M. FrahmJul 19, 1997
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Damage spreading in the 'sandpile' model of SOC
We have studied the damage spreading (defined in the text) in the 'sandpile' model of self organised criticality. We have studied the variations of the critical time (defined in the text) and…
Ajanta BhowalJul 19, 1997
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Charging Spectrum and Configurations of a Wigner Crystal Island
Charging of a clean two-dimensional island is studied in the regime of small concentration of electrons when they form the Wigner crystal. Two forms of electron-electron interaction potential are…
A. A. Koulakov, B. I. ShklovskiiJul 18, 1997
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Shearing the Vacuum - Quantum Friction
We consider two perfectly smooth featureless surfaces at T=0, defined only by their respective dielectric functions, separated by a finite distance, and ask the question whether they can experience…
JB PendryJul 18, 1997
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Phase ordering in bulk uniaxial nematic liquid crystals
The phase-ordering kinetics of a bulk uniaxial nematic liquid crystal is addressed using techniques that have been successfully applied to describe ordering in the O(n) model. The method involves…
Robert A. WickhamJul 18, 1997
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Relaxation of Surface Profiles by Evaporation Dynamics
We present simulations of the relaxation towards equilibrium of one dimensional steps and sinusoidal grooves imprinted on a surface below its roughening transition. We use a generalization of the…
Johannes HagerJul 18, 1997
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Phase Separation Driven by External Fluctuations
The influence of external fluctuations in phase separation processes is analysed. These fluctuations arise from random variations of an external control parameter. A linear stability analysis of the…
J. Garcia-Ojalvo, A. M. Lacasta, J. M. Sancho et al.Jul 18, 1997
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Boundary degrees of freedom in fractional quantum Hall effect: Excitations on common boundary of two samples
Using the Carlip's method we have derived the boundary action for the fermion Chern-Simons theory of quantum Hall effects on a planar region with a boundary. We have computed both the bulk and…
Dongsu Bak, Sang Pyo Kim, Sung Ku Kim et al.Jul 17, 1997
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Coexistence of Haldane gap excitations and long-range order in R2BaNiO5 (R=rare earth)
R2BaNiO5 (R= rare earth) quasi-1-D antiferromagnets are structurally equivalent to the well-studied 1-D S=1 Haldane-gap compound Y2BaNiO5. Unlike the Y-nickelate though, these materials…
A. ZheludevJul 16, 1997
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The square-lattice spiral magnet Ba2CuGe2O7 in an in-plane magnetic field
The magnetic structure of Ba2CuGe2O7 is investigated by neutron diffraction in magnetic fields applied along several directions in the (a,b) plane of the crystal. In relatively weak fields,…
A. Zheludev, S. Maslov, G. Shirane et al.Jul 16, 1997
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New Far Infrared Vibrational Mode in Zn Doped CuGeO3
We report on far infrared measurements on Zn and Si doped crystals of the spin-Peierls compound CuGeO3. Zn doping has the effect of introducing several new absorption lines, polarized in the…
J. J. McGuire, T. Room, T. E. Mason et al.Jul 16, 1997
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A Single Impurity in Tomonaga-Luttinger Liquids
The problem of a single impurity in one dimensional Tomonaga-Luttinger liquids with a repulsive electron-electron interaction is discussed. We find that the renormalization group flow diagram for the…
Yuval Oreg, Alexander M. Finkel'steinJul 16, 1997
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Reply to the Comment on "Enhancement of the Tunneling Density of States in Tomonaga-Luttinger Liquids"
In their comment Fabrizio and Gogolin dispute our result of the enhancement of the tunneling density of states in a Tomonaga-Luttinger liquid at the location of a backward scattering defect [Phys.…
Yuval Oreg, Alexander M. Finkel'steinJul 16, 1997
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Averaged Green function and density of states for electrons in a high magnetic field and random potential
We consider a model for 2D electrons in a very strong magnetic field (i.e. projected onto a single Landau level) and a random potential V. The computation of the averaged Green function for this…
A. Kristoffersen, K. OlaussenJul 16, 1997
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Exact Optical Dielectric Function of a Nearly Homogeneous Solid
Based on an exactly solvable model of a nearly homogeneous solid (jellium+phonons), we compute the optical dielectric function exactly at zero temperature in any number of spatial dimensions. It is…
Girish S. Setlur, Yia-Chung ChangJul 14, 1997
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Stochastic Effects in Physical Systems
A tutorial review is given of some developments and applications of stochastic processes from the point of view of the practicioner physicist. The index is the following: 1.- Introduction 2.-…
Maxi San Miguel, Raul ToralJul 14, 1997
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Josephson effect between trapped Bose-Einstein condensates
We study the Josephson effect between atomic Bose-Einstein condensates. By drawing on an electrostatic analogy, we derive a semiclassical functional expression for the three-dimensional Josephson…
Ivar Zapata, Fernando Sols, Anthony J. LeggettJul 14, 1997
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Stochastic Resonance in Noisy Non-Dynamical Systems
We have analyzed the effects of the addition of external noise to non-dynamical systems displaying intrinsic noise, and established general conditions under which stochastic resonance appears. The…
J. M. G. Vilar, G. Gomila, J. M. RubíJul 14, 1997
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A new class of exactly solvable interacting fermion models in one dimension
We investigate a model containing two species of one-dimensional fermions interacting via a gauge field determined by the positions of all particles of the opposite species. The model can be solved…
H. J. Schulz, B. S. ShastryJul 12, 1997
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Intermediate Valence Model for the Colossal Magnetoresistance in Tl2Mn2O7
The colossal magnetoresistance exhibited by Tl2Mn2O7 is an interesting phenomenon, as it is very similar to that found in perovskite manganese oxides although the compound differs both in…
C. I. Ventura, B. AlascioJul 11, 1997
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Eu-Eu exchange interaction and Eu distribution in Pb(1-x)Eu(x)Te from magnetization steps
The magnetization of Pb1-xEuxTe samples with x = 1.9, 2.6 and 6.0% was measured at 20 mK in fields up to 50 kOe, and at 0.6 K in fields up to 180 kOe. The 20 mK data show the magnetization…
Ewout ter Haar, Valdir Bindilatti, Nei F. Oliveira et al.Jul 11, 1997
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Classical quasi-particle dynamics in trapped Bose condensates
The dynamics of quasi-particles in repulsive Bose condensates in a harmonic trap is studied in the classical limit. In isotropic traps the classical motion is integrable and separable in spherical…
Martin Fliesser, András Csordás, Robert Graham et al.Jul 11, 1997
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Does femtosecond time-resolved second-harmonic generation probe electron temperatures at surfaces?
Femtosecond pump-probe second-harmonic generation (SHG) and transient linear reflectivity measurements were carried out on polycrystalline Cu, Ag and Au in air to analyze whether the electron…
J. Hohlfeld, U. Conrad, E. MatthiasJul 11, 1997
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