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Condensed Matter papers — page 123

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High-field AFMR in single-crystalline La0.95Sr0.05MnO3: Experimental evidence for the existence of a canted magnetic structure
High-field antiferromagnetic-resonance (AFMR) spectra were obtained in the frequency range 60 GHz < ν< 700 GHz and for magnetic fields up to 8 T in twin-free single crystals of…
A. Pimenov, M. Biberacher, D. Ivannikov et al.Feb 28, 2000
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Intermittent implosion and pattern formation of trapped Bose-Einstein condensates with attractive interaction
The collapsing dynamics of a trapped Bose-Einstein condensate (BEC) with attractive interaction are revealed to exhibit two previously unknown phenomena. During the collapse, BEC undergoes a series…
Hiroki Saito, Masahito UedaFeb 25, 2000
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Mechanical detection of nuclear spin relaxation in a micron-size crystal
A room temperature nuclear magnetic resonance force microscope (MRFM), fitted in a 1Tesla electromagnet, is used to measure the nuclear spin relaxation of 1H in a micron-size (70ng) crystal of…
O. Klein, V. V. Naletov, H. AlloulFeb 25, 2000
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The effect of strain on the adsorption of CO on Pd(100)
We study how the binding energy, the vibrational frequencies and the adsorption isotherm of CO on Pd(100) are modified when the solid is subject to uniform strain. The parameters controlling the…
M. W. Wu, H. MetiuFeb 25, 2000
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Super-radiant light scattering from trapped Bose Einstein condensates
We propose a new formulation for atomic side mode dynamics from super-radiant light scattering of trapped atoms. A detailed analysis of the recently observed super-radiant light scattering from…
Ozgur E. Mustecaplioglu, L. YouFeb 25, 2000
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How to mode-lock an atom laser
We consider a possible technique for mode-locking an atom laser, based on the generation of a dark soliton in a ring-shaped Bose-Einstein condensate, with repulsive atomic interactions. The soliton…
Peter D. Drummond, Antonios Eleftheriou, Kerson Huang et al.Feb 24, 2000
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Snake orbits and related magnetic edge states
We study the electron motion near magnetic field steps at which the strength and/or sign of the magnetic field changes. The energy spectrum for such systems is found and the electron states (bound…
J. Reijniers, F. M. PeetersFeb 24, 2000
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Wealth condensation in a simple model of economy
We introduce a simple model of economy, where the time evolution is described by an equation capturing both exchange between individuals and random speculative trading, in such a way that the…
Jean-Philippe Bouchaud, Marc MezardFeb 24, 2000
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Random-mass Dirac fermions in an imaginary vector potential: Delocalization transition and localization length
One dimensional system of Dirac fermions with a random-varying mass is studied by the transfer-matrix methods which we developed recently. We investigate the effects of nonlocal correlation of the…
Koujin Takeda, Ikuo IchinoseFeb 24, 2000
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Temperature effect in the Casimir attraction of a thin metal film
The Casimir effect for conductors at arbitrary temperatures is theoretically studied. By using the analytical properties of the Green functions and applying the Abel-Plan formula to Lifshitz's…
V. N. Dubrava, V. A. Yampol'skiiFeb 24, 2000
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Three-body recombination in Bose gases with large scattering length
An effective field theory for the three-body system with large scattering length is applied to three-body recombination to a weakly-bound s-wave state in a Bose gas. Our model independent analysis…
P. F. Bedaque, E. Braaten, H. -W. HammerFeb 23, 2000
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Single and Paired Point Defects in a 2D Wigner Crystal
Using the path-integral Monte Carlo method, we calculate the energy to form single and pair vacancies and interstitials in a two-dimensional Wigner crystal of electrons. We confirm that the…
Ladir Cândido, Philip Phillips, D. M. CeperleyFeb 23, 2000
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Collective Phenonema in the Interaction of Radiation with Matter
The aim of this communication is to present in a concentrated form the main ideas of a method, developed by the author, for treating strongly nonequilibrium collective phenomena typical of the…
V. I. YukalovFeb 23, 2000
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Numerical analyses of the nonequilibrium electron transport through the Kondo impurity beside the Toulouse point
Nonequilibrium electron transport through the Kondo impurity is investigated numerically for the system with twenty conduction-electron levels. The electron current under finite voltage drop is…
Yoshihiro NishiyamaFeb 23, 2000
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Many Body Diffusion and Interacting Electrons in a Harmonic Confinement
We present numerically exact energy estimates for two-dimensional electrons in a parabolic confinement. By application of an extension of the recently introduced many-body diffusion algorithm, the…
F. Luczak, F. Brosens, J. T. Devreese et al.Feb 22, 2000
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Gaussian to Exponential Crossover in the Attenuation of Polarization Echoes in NMR
An ingenious pulse sequence devised by S. Zhang, B. H. Meier, and R. R. Ernst (Phys. Rev. Lett. 69, 2149 (1992)) reverses the time evolution (``spin diffusion'') of the local…
Gonzalo Usaj, Horacio M. Pastawski, Patricia R. LevsteinFeb 21, 2000
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New way to achieve chaotic synchronization in spatially extended systems
We study the spatio-temporal behavior of simple coupled map lattices with periodic boundary conditions. The local dynamics is governed by two maps, namely, the sine circle map and the logistic map…
Bikash Chandra Gupta, P. A. Sreeram, S. B. LeeFeb 21, 2000
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Modes of counterion density-fluctuations and counterion-mediated attractions between like-charged fluid membranes
Counterion-mediated attractions between like-charged fluid membranes are long-ranged and non-pairwise additive at high temperatures. At zero temperature, however, they are pairwise additive and decay…
Bae-Yeun HaFeb 21, 2000
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Quenched Averaged Correlation Functions of the Random Magnets
It is shown that the ratios of the quenched averaged three and four-point correlation functions of the local energy density operator to the connected ones in the random-bond Ising model approach…
M. Reza Rahimi TabarFeb 19, 2000
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Linear and nonlinear susceptibilities of a decoherent two-level system
The linear and nonlinear dynamical susceptibilities of a two level system are calculated as it undergoes a transition to a decoherent state. Analogously to the Glover-Tinkham-Ferrell sum rule of…
Gregory LevineFeb 19, 2000
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Delocalization of two-particle ring near the Fermi level of 2d Anderson model
We study analytically and numerically the problem of two particles with a long range attractive interaction on a two-dimensional (2d) lattice with disorder. It is shown that below some critical…
J. Lages, D. L. ShepelyanskyFeb 18, 2000
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Order-disorder model of phase transitions in the DMAGaS-DMAAlS family crystals
A four-state model is proposed for description of the sequence of phase transitions in ferroelectric crystals of DMAGaS and DMAAlS type. The ordering processes in the subsystems of DMA groups are…
I. V. Stasyuk, O. V. VelychkoFeb 18, 2000
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Dynamics of Excited Electrons in Copper: Role of Auger Electrons
Within a theoretical model based on the Boltzmann equation, we analyze in detail the structure of the unusual peak recently observed in the relaxation time in Cu. In particular, we discuss the role…
R. Knorren, G. Bouzerar, K. H. BennemannFeb 18, 2000
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Current bistability and hysteresis in strongly correlated quantum wires
Nonequilibrium transport properties are determined exactly for an adiabatically connected single channel quantum wire containing one impurity. Employing the Luttinger liquid model with interaction…
R. Egger, H. Grabert, A. Koutouza et al.Feb 18, 2000
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Ab initio Hartree-Fock Born effective charges of LiH, LiF, LiCl, NaF, and NaCl
We use the Berry-phase-based theory of macroscopic polarization of dielectric crystals formulated in terms of Wannier functions, and state-of-the-art Gaussian basis functions, to obtain benchmark ab…
Alok ShuklaFeb 18, 2000
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