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Condensed Matter papers — page 95

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Deep Inelastic Neutron Scattering determination of the single particle kinetic energy in solid and liquid 3He
For the first time, an experimental determination of the single-particle mean kinetic energies for 3He along the T=2.00 K isotherm in the dense liquid and in the solid hcp and bcc phases is reported.…
R. Senesi, C. Andreani, D. Colognesi et al.Feb 8, 2001
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Aspects of Discrete Breathers and New Directions
We describe results concerning the existence proofs of Discrete Breathers (DBs) in the two classes of dynamical systems with optical linear phonons and with acoustic linear phonons. A standard…
S. Aubry, G. KopidakisFeb 8, 2001
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Field theory of self-organized fractal etching
We propose a phenomenological field theoretical approach to the chemical etching of a disordered-solid. The theory is based on a recently proposed dynamical etching model. Through the introduction of…
Andrea Gabrielli, Miguel A. Munoz, Bernard SapovalFeb 8, 2001
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Optimal conditions for observing Josephson oscillations in a double-well Bose-gas condensate
The Josephson oscillations between condensates in a double-well trap are known theoretically to be strongly effected by the mean field interaction in dilute atomic gases. The most important effect is…
J. E. WilliamsFeb 8, 2001
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New Monte Carlo Iteration Method for Generalized Ensembles
We present a new and general Monte Carlo iteration method for generalized ensembles. It consists of two elements: (1) a simple algorithm to distinguish between distributions arising from respectively…
J. BorgFeb 7, 2001
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Bounds on one-dimensional exchange energies with application to lowest Landau band quantum mechanics
By means of a generalization of the Fefferman-de la Llave decomposition we derive a general lower bound on the interaction energy of one-dimensional quantum systems. We apply this result to a…
Christian Hainzl, Robert SeiringerFeb 7, 2001
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Electron-Phonon Interactions Cause HTSC
What is the microscopic interaction responsible for high temperature superconductivity (HTSC)? Here data on temporal relaxation of Tc and the room temperature conductivity in YBa2Cu3O(6+x) after…
J. C. PhillipsFeb 6, 2001
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Total-energy-based prediction of a quasicrystal structure
Quasicrystals are metal alloys whose noncrystallographic symmetry and lack of structural periodicity challenge methods of experimental structure determination. Here we employ quantum-based…
M. Mihalkovič, I. Al-Lehyani, E. Cockayne et al.Feb 5, 2001
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Novel Quantum Spin Assisted Tunneling in Half Metallic Manganite Tunnel Junctions
The electron tunneling in half metallic manganite tunnel junctions is studied by using a quantum mechanically treated double exchange model. We show that the stimulation of spin excitations, caused…
R. Y. Gu, L. Sheng, C. S. TingFeb 5, 2001
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Simulation of polysilane and polysilyne formation and structure
We present Monte Carlo simulations of the formation and structure of polysilane, hybrid polysilane/polysilyne and polysilyne networks. The simulation technique allows for the investigation of large…
R. L. C. Vink, G. T. Barkema, C. A. van Walree et al.Feb 5, 2001
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New correlation duality relations for the planar Potts model
We introduce a new method to generate duality relations for correlation functions of the Potts model on planar graphs. The method extends previously known results, by allowing the consideration of…
C. King, F. Y. WuFeb 5, 2001
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Superfluid and Dissipative Dynamics of a Bose-Einstein Condensate in a Periodic Optical Potential
We create Bose-Einstein condensates of 87-rubidium in a static magnetic trap with a superimposed blue-detuned 1D optical lattice. By displacing the magnetic trap center we are able to control the…
S. Burger, F. S. Cataliotti, C. Fort et al.Feb 5, 2001
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Small-world behavior in a system of mobile elements
We analyze the propagation of activity in a system of mobile automata. A number r Ld of elements move as random walkers on a lattice of dimension d, while with a small probability p they can jump to…
Susanna C. Manrubia, Jordi Delgado, Bartolo LuqueFeb 5, 2001
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Disorder and superconductivity : a new phase of bi-particle localized states
We study the two-dimensional, disordered, attractive Hubbard model by the projector quantum Monte Carlo method and Bogoliubov - de Gennes mean-field theory. Our results for the ground state show the…
Bhargavi Srinivasan, Dima L. ShepelyanskyFeb 3, 2001
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Electronic structure and string tension of stripes in high-Tc superconductors
We present a simple, material-specific model Hamiltonian for stripes and use it to explain the observed differences between the angle-resolved photoemission spectra of La(2-x)Sr(x)CuO4 and…
Marcus Fleck, Eva Pavarini, Ole Krogh AndersenFeb 2, 2001
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Perturbation theory for the one-dimensional optical polaron
The one-dimensional optical polaron is treated on the basis of the perturbation theory in the weak coupling limit. A special matrix diagrammatic technique is developed. It is shown how to evaluate…
P. A. KhomyakovFeb 2, 2001
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Strong coupling theory for tunneling and vibrational relaxation in driven bistable systems
A study of the dynamics of a tunneling particle in a driven bistable potential which is moderately-to-strongly coupled to a bath is presented. Upon restricting the system dynamics to the Hilbert…
M. Thorwart, M. Grifoni, P. HänggiFeb 2, 2001
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Thermodynamic Study of Excitations in a 3D Spin Liquid
In order to characterize thermal excitations in a frustrated spin liquid, we have examined the magnetothermodynamics of a model geometrically frustrated magnet. Our data demonstrate a crossover in…
Y. K. Tsui, J. Snyder, P. SchifferFeb 2, 2001
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Specific heat of the Kelvin modes in low temperature superfluid turbulence
It is pointed out that the specific heat of helical vortex line excitations, in low temperature superfluid turbulence experiments carried out in helium II, can be of the same order as the specific…
Uwe R. FischerFeb 1, 2001
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Stability of exact solutions of the defocusing nonlinear Schrodinger equation with periodic potential in two dimensions
The cubic nonlinear Schrodinger equation with repulsive nonlinearity and elliptic function potential in two-dimensions models a repulsive dilute gas Bose--Einstein condensate in a lattice potential.…
Bernard Deconinck, Bela A. Frigyik, J. Nathan KutzJan 31, 2001
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Raman scattering by electron-hole excitations in silver nanocrystals
Raman scattering experiments from silver nanocrystals embedded in films of amorphous silica are reported. In addition to the low-frequency peak due to vibrational quadrupolar modes, a broadband is…
H. Portales, E. Duval, L. Saviot et al.Jan 31, 2001
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The Three - Dimensional Z2 Electrodynamics and the Two - Dimensional Ising Model
The correlation functions are calculated for the three - dimensional Z2 electrodynamics for the particular values of the ineraction energies and for the free boundary conditions.
Yu. M. ZinovievJan 31, 2001
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Effective Theory For Quantum Spin System In Low Dimension - Beyond Long-Wavelength Limit
An effective theory for quantum spin system in low dimension is constructed in the finite-q regime. It is shown that there are field configurations for which Wess-Zumino term contributes to the…
Ranjan Chaudhury, Samir K. PaulJan 31, 2001
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Solution of a Generalized Stieltjes Problem
We present the exact solution for a set of nonlinear algebraic equations 1zl= πd + 2 dn Σm ≠ l 1zl-zm. These were encountered by us in a recent study of the…
B. Sriram Shastry, Abhishek DharJan 31, 2001
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On the origin of heavy quasiparticles in LiV2O4
An explanation is provided for the heavy quasiparticle excitations in LiV2O4. It differs considerably from that of other known heavy-fermion systems. Main ingredients of our theory are the cubic…
P. Fulde, A. N. Yaresko, A. A. Zvyagin et al.Jan 30, 2001
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