Skip to content

Condensed Matter papers — page 189

cond-matBrowse archive

Excitations and S-matrix for su(3) spin chain combining 3 and $3*
The associated Hamiltonian for a su(3) spin chain combining 3 and 3* representations is calculated. The ansatz equations for this chain are obtained and solved in the thermodynamic limit,…
J. Abad, M. RíosJan 14, 1998
Learn
Scaling Range and Cutoffs in Empirical Fractals
Fractal structures appear in a vast range of physical systems. A literature survey including all experimental papers on fractals which appeared in the six Physical Review journals (A-E and Letters)…
Ofer Malcai, Daniel A. Lidar, Ofer Biham et al.Jan 14, 1998
Learn
Dynamic percolation and Slow Relaxation in Glass-like Materials
Glass-like materials are nonequilibrium systems where the relaxation time may exceed reasonable time scales of observations. In the present paper a dynamic percolation model is introduced in order to…
A. Vazquez, O. Sotolongo-CostaJan 13, 1998
Learn
Periodic Modulation Induced Increase of Reaction Rates in Autocatalytic Systems
We propose a new mechanism to increase the reactions ratesin multistable autocatalytic systems. The mechanism is based upon the possibility for the enhancement of the response of the system due to…
T. Alarcon, A. Perez-Madrid, J. M. RubiJan 13, 1998
Learn
Stochastic Resonance in Nonpotential Systems
We propose a method to analytically show the possibility for the appearance of a maximum in the signal-to-noise ratio in nonpotential systems. We apply our results to the FitzHugh-Nagumo model under…
T. Alarcon, A. Perez-Madrid, J. M. RubiJan 13, 1998
Learn
Ring vortex destabilization in supersaturated 3He-4He liquid mixtures at low temperatures
The effect of ring vortices on the destabilization of supersaturated liquid helium mixtures at very low temperatures is investigated as a function of pressure. We have found that large ring vortices…
D. M. Jezek, M. Pi, M. Barranco et al.Jan 13, 1998
Learn
Skyrmion in a real magnetic film
Skyrmions are the magnetic defects in an ultrathin magnetic film, similar to the bubble domains in the thicker films. Even weak uniaxial anisotropy determines its radius unambiguously. We consider…
Ar. Abanov, V. L. PokrovskyJan 13, 1998
Learn
Persistent Currents and Magnetization in two-dimensional Magnetic Quantum Systems
Persistent currents and magnetization are considered for a two-dimensional electron (or gas of electrons) coupled to various magnetic fields. Thermodynamic formulae for the magnetization and the…
Jean Desbois, Stephane Ouvry, Christophe TexierJan 12, 1998
Learn
The Quantum Hall Effect in Quasi-1D Conductors
The theory and experiments showing Quantum Hall effect in the quasi-one-dimensional conductors of the Bechgaard salts family are briefly reviewed. The sign reversals observed under some experimental…
G. Montambaux, D. ZanchiJan 12, 1998
Learn
Negative Electric Current in Semiconductors
Electric current in semiconductors is considered as a function of time. Nonequilibrium fluctuations of the current are studied for strongly nonuniform samples. It is demonstrated that at special…
V. I. Yukalov, E. P. YukalovaJan 12, 1998
Learn
Spectral Flow and the Dynamics of Dislocations in Charge Density Waves
The spectral flow in the cores of moving dislocations is found to play an important role in the dynamics and transport of charge density wave (CDW) by significantly modifying the hydrodynamic…
Masahiko HayashiJan 12, 1998
Learn
Bloch electrons in a Jahn-Teller crystal and an orbital-density-wave state due to the Berry phase
The effect of the Berry phase is included explicitly in the wavefunction describing conduction electrons in a crystal composed of periodically arrayed Jahn-Teller centers that have conically…
H. Koizumi, T. Hotta, Y. TakadaJan 12, 1998
Learn
Stochastic Diagrams for Critical Point Spectra
A new technique for calculating the time-evolution, correlations and steady state spectra for nonlinear stochastic differential equations is presented. To illustrate the method, we consider examples…
S. Chaturvedi, P. D. DrummondJan 9, 1998
Learn
Dynamics of Bose condensed gases in highly deformed traps
We provide a unified investigation of normal modes and sound propagation at zero temperature in Bose condensed gases confined in highly asymmetric harmonic traps and interacting with repulsive…
S. StringariJan 8, 1998
Learn
Stick-slip Transition in the Scalar Arching Model
When some granular material contained into a silo is pushed upwards with a piston, an irregular stick-slip motion of the system of grains is observed. We show how one can adapt the `Scalar Arching…
Philippe Claudin, Jean-Philippe BouchaudJan 7, 1998
Learn
Monte Carlo simulation of magnetization reversal via domain-wall motion in Fe sesquilayers on W(110)
Iron sesquilayers are ultrathin films with coverages between one and two atomic monolayers. They consist of an almost defect-free monolayer with compact islands of a second atomic layer on top. This…
M. Kolesik, M. A. Novotny, Per Arne RikvoldJan 7, 1998
Learn
Periodic features in the Dynamic Structure Factor of the Quasiperiodic Period-doubling Lattice
We present an exact real-space renormalization group (RSRG) method for evaluating the dynamic structure factor of an infinite one-dimensional quasiperiodic period-doubling (PD) lattice. We observe…
Anathnath Ghosh, S. N. KarmakarJan 7, 1998
Learn
Plasma instability and amplification of electromagnetic waves in low-dimensional electron systems
A general electrodynamic theory of a grating coupled two dimensional electron system (2DES) is developed. The 2DES is treated quantum mechanically, the grating is considered as a periodic system of…
S. A. MikhailovJan 7, 1998
Learn
Physical nature of all the electronic states in the Thue-Morse chain
We present an analytical method for finding all the electronic eigenfunctions and eigenvalues of the aperiodic Thue-Morse lattice. We prove that this system supports only extended electronic states…
Anathnath Ghosh, S. N. KarmakarJan 7, 1998
Learn
A divergent correlation length in off-equilibrium glasses
In off-equilibrium dynamics we define a dynamical correlation length which is proportional to the size of the region in which the atoms move in a correlated way. General arguments indicate that this…
Giorgio ParisiJan 6, 1998
Learn
Hydrodynamic damping in trapped Bose gases
Griffin, Wu and Stringari have derived the hydrodynamic equations of a trapped dilute Bose gas above the Bose-Einstein transition temperature. We give the extension which includes hydrodynamic…
T. Nikuni, A. GriffinJan 6, 1998
Learn
Role of quasiparticles in the growth of a trapped Bose-Einstein condensate
A major extension of the model of condensate growth introduced by us is made to take account of the evolution of the occupations of lower trap levels (quasiparticles) by scattering processes, and of…
C. W. Gardiner, M. D. Lee, R. J. Ballagh et al.Jan 5, 1998
Learn
Shadow Bands and Tunneling Magnetoresistance in Itinerant Electron Ferromagnets
In itinerant electron ferromagnets spectral weight is transferred at finite temperatures from quasiparticle peaks located at majority and minority-spin band energies to shadow-band peaks. For a given…
A. H. MacDonald, T. Jungwirth, M. KasnerJan 5, 1998
Learn
The charge density of semiconductors in the GW approximation
We present a method to calculate the electronic charge density of periodic solids in the GW approximation, using the space-time method. We investigate for the examples of silicon and germanium to…
Martin M. Rieger, R. W. GodbyJan 5, 1998
Learn
Effect of electron corelation on superconducting pairing symmetry
The role of electron correlation on different pairing symmetries are discussed in details where the electron correlation has been treated within the slave boson formalism. It is shown that for a pure…
Manidipa Mitra, Haranath Ghosh, S. N. BeheraJan 2, 1998
Learn
← PreviousPage 189Next →