Theory of Dielectric Absorption Line Shape in Dielectrics and FerroelectricsWe present the theory of dielectric spectra allowing for homogeneous and inhomogeneous broadening mechanisms contributions. The dielectric absorption line shape for oscillators with memory and Debye…M. D. Glinchuk, I. V. Kondakova·Aug 27, 1999SaveLearn
Thermodynamics of hexagonal-close-packed iron under Earth's core conditionsThe free energy and other thermodynamic properties of hexagonal-close-packed iron are calculated by direct ab initio methods over a wide range of pressures and temperatures relevant to the…D. Alfe`, G. D. Price, M. J. Gillan·Aug 27, 1999SaveLearn
Magnons in real materials from density-functional theoryWe present an implementation of the adiabatic spin-wave dynamics of Niu and Kleinman. This technique allows to decouple the spin and charge excitations of a many-electron system using a…Ralph Gebauer, Stefano Baroni·Aug 26, 1999SaveLearn
Spin-1/2 periodic nonuniform XX chains and the spin-Peierls instabilityUsing continued fractions we obtained the exact result for the density of magnon states of the regularly alternating spin-1/2 XX chain with Dzyaloshinskii-Moriya interaction. We examined the…O. Derzhko, J. Richter, O. Zaburannyi·Aug 26, 1999SaveLearn
Non-equilibrium steady state of the superfluid mixtures of helium isotopes at classical temperaturesThe size effect in the gas of impuritons of the superfluid mixtures of helium isotopes is investigated by taking into consideration the contribution of thermal excitations. The solution is obtained…A. I. Chervanyov·Aug 26, 1999SaveLearn
Liquid 4He near the superfluid transition in the presence of a heat current and gravityThe effects of a heat current and gravity in liquid 4He near the superfluid transition are investigated for temperatures above and below Tlambda. We present a renormalization-group calculation based…Rudolf Haussmann·Aug 26, 1999SaveLearn
Supercurrent Stability in a Quasi-1D Weakly Interacting Bose GasWe discuss a possibility of observing superfluid phenomena in a quasi-1D weakly interacting Bose gas at finite temperatures. The weakness of interaction in combination with generic properties of 1D…Yu. Kagan, N. V. Prokof'ev, B. V. Svistunov·Aug 26, 1999SaveLearn
Enhancements to the GW space-time methodWe describe the following new features which significantly enhance the power of the recently developed real-space imaginary-time GW scheme (Rieger et al., Comp. Phys. Commun. 117, 211 (1999)) for the…L. Steinbeck, A. Rubio, L. Reining et al.·Aug 26, 1999SaveLearn
Nonequilibrium phase transitions induced by multiplicative noise: effects of self-correlationA recently introduced lattice model, describing an extended system which exhibits a reentrant (symmetry-breaking, second-order) noise-induced nonequilibrium phase transition, is studied under the…S. E. Mangioni, R. R. Deza, R. Toral et al.·Aug 25, 1999SaveLearn
Understanding depletion forces beyond entropyThe effective interaction energy of a colloidal sphere in a suspension containing small amounts of non-ionic polymers and a flat glass surface has been measured and calculated using total internal…C. Bechinger, D. Rudhardt, P. Leiderer et al.·Aug 25, 1999SaveLearn
Gaudin Hypothesis for the XYZ Spin ChainThe XYZ spin chain is considered in the framework of the generalized algebraic Bethe ansatz developed by Takhtajan and Faddeev. The sum of norms of the Bethe vectors is computed and expressed in the…Yasuhiro Fujii, Miki Wadati·Aug 24, 1999SaveLearn
Electron Spin Resonance of defects in the Haldane System Y(2)BaNiO(5)We calculate the electron paramagnetic resonance (EPR) spectra of the antiferromagnetic spin-1 chain compound Y(2)BaNi(1-x)Mg(x)O(5) for different values of x and temperature T much lower than the…C. D. Batista, K. Hallberg, A. A. Aligia·Aug 24, 1999SaveLearn
Spin Dynamics of Rare Earth Ions in Phosphate Laser GlassesThe spin dynamics of rare earth ions (Er, Nd, Sm and Gd) in heavily doped phosphate glasses have been investigated using 31P NMR. Correlation times in the range 10-2 to 10-12 s have been obtained…I. P. Goudemond, J. M. Keartland, M. J. R. Hoch et al.·Aug 24, 1999SaveLearn
Material failure time and the fiber bundle model with thermal noiseThe statistical properties of failure are studied in a fiber bundle model with thermal noise. We find that in agreement with recent experiments the macroscopic failure is produced by a thermal…A. Guarino, R. Scorretti, S. Ciliberto·Aug 24, 1999SaveLearn
Supersymmetry on a lattice and Dirac fermions in a random vector potentialWe study two-dimensional Dirac fermions in a random non-Abelian vector potential by using lattice regularization. We consider U(N) random vector potential for large N. The ensemble average with…Ikuo Ichinose·Aug 23, 1999SaveLearn
The General Structure of Bose Gases with Arbitrary SpinMotivated by the recent discoveries of spin-1 and spin-1/2 Bose gas, we have studied the general structure of the Bose gases with arbitrary spin. A general method is developed to uncover the…Tin-Lun Ho, Lan Yin·Aug 21, 1999SaveLearn
Ising cubes with enhanced surface couplingsUsing Monte Carlo techniques, Ising cubes with ferromagnetic nearest-neighbor interactions and enhanced couplings between surface spins are studied. In particular, at the surface transition, the…M. Pleimling, W. Selke·Aug 20, 1999SaveLearn
A Superconducting Persistent Current QubitWe present the design of a superconducting qubit that has circulating currents of opposite sign as its two states. The circuit consists of three nano-scale aluminum Josephson junctions connected in a…T. P. Orlando, J. E. Mooji, Lin Tian et al.·Aug 19, 1999SaveLearn
Scattering of light and atoms in a Fermi-Dirac gas with BCS pairingWe theoretically study the optical properties of a Fermi-Dirac gas in the presence of a superfluid state. We calculate the leading quantum-statistical corrections to the standard column density…J. Ruostekoski·Aug 19, 1999SaveLearn
Transient Effect of Negative Electric Current in Irradiated SemiconductorsThe peculiarities of electric current are studied occurring in semiconductors with strongly nonuniform distribution of charge carriers. The formation of such nonuniformities and the regulation of…V. I. Yukalov, E. P. Yukalova·Aug 19, 1999SaveLearn
Fermi edge singularities in X-ray spectra of strongly correlated fermionsWe discuss the problem of the X-ray absorption in a system of interacting fermions and, in particular, those features in the X-ray spectra that can be used to discriminate between conventional…D. V. Khveshchenko, P. W. Anderson·Aug 19, 1999SaveLearn
Why Self-Consistent Diagrammatic Perturbation Theory is `just' Perturbation TheoryIn this short write-up we argue that self-consistent diagrammatic perturbation theory(i.e. Feynman diagrams) for the one-particle Green function is unable to capture some important qualitative…Girish S. Setlur·Aug 19, 1999SaveLearn
Spin Dynamics of a Fermi Liquid in an Electric FieldThe influence of an external electric field on the spin dynamics of an electrically neutral Fermi liquid is considered, the mechanism of such an influence being the relativistic spin-orbital…P. L. Krotkov·Aug 18, 1999SaveLearn
The spectral conductance of a proximity superconductor and the re-entrance effectIn a mesoscopic metal in proximity with a superconductor, the electronic conductance is enhanced in a very energy-sensitive way. In this paper, we discuss the spectral conductance of a proximity…H. Courtois, P. Charlat, Ph. Gandit et al.·Aug 18, 1999SaveLearn
Criterion for Dominance of Directional over Size Fluctuations in Destroying OrderFor systems exhibiting a second-order phase transition with a spontaneously broken continuous O(N)-symmetry at low temperature, we give a criterion for judging at which temperature TK long-range…H. Kleinert·Aug 17, 1999SaveLearn