Magnetic Susceptibility for CaV4O9We examine experimental magnetic susceptibility χtot(T) for CaV4O9 by fitting with fitting function αχmag(T) + c. The function χmag(T) is a power series of 1/T and the lowest…Ken'ichi Takano, Kazuhiro Sano·May 13, 1998SaveLearn
Boulevard of Broken SymmetriesEffective theories of quantum liquids (superconductors and superfluids of various types) are derived starting from microscopic models at the absolute zero of temperature. Special care is taken to…Adriaan M. J. Schakel·May 13, 1998SaveLearn
Diffusion on a Rearranging LatticeIn this paper we present a computer simulation of a random walk (RW) for diffusion on a rearranging lattice. The lattice consists of two types of sites -- one good conducting (type 1) and the other…Aninda Jiban Bhattacharyya, S. Tarafdar·May 12, 1998SaveLearn
Fermionic representations of integrable lattice systemsWe develop a general scheme for the use of Fermi operators within the framework of integrable systems. This enables us to read off a fermionic Hamiltonian from a given solution of the Yang-Baxter…Frank Göhmann, Shuichi Murakami·May 11, 1998SaveLearn
Perturbative Corrections to the Ohta-Jasnow-Kawasaki Theory of Phase-Ordering DynamicsA perturbation expansion is considered about the Ohta-Jasnow-Kawasaki theory of phase-ordering dynamics; the non-linear terms neglected in the OJK calculation are reinstated and treated as a…C. L. Emmott·May 11, 1998SaveLearn
Superflow-Stabilized Nonlinear NMR in Rotating 3He-BNonlinear spin precession has been observed in 3He-B in large counterflow of the normal and superfluid fractions. The new precessing state is stabilized at high rf excitation level and displays…V. V. Dmitriev, V. B. Eltsov, M. Krusius et al.·May 11, 1998SaveLearn
Lattice Distortion Mediated Paramagnetic Relaxation in High-Spin High-Symmetry Molecular MagnetsField-dependent maxima in the relaxation rate of the magnetic molecules Mn12-Ac and Fe8-tacn have commonly been ascribed to some resonant tunneling phenomenon. We argue instead that the relaxation…Anupam Garg·May 11, 1998SaveLearn
Assisted Tunneling in Ferromagnetic Junctions and Half-Metallic OxidesDifferent mechanisms of spin-dependent tunneling are analyzed with respect to their role in tunnel magnetoresistance (TMR). Microscopic calculation within a realistic model shows that direct…A. M. Bratkovsky·May 10, 1998SaveLearn
Fictitious flux confinement: magnetic pairing in coupled spin chains or planesThe spinon and holon excitations of two-leg Heisenberg or lightly doped t-J ladders are shown to be bound in pairs by string confinement forces given approximately by the antiferromagnetic exchange…Martin Greiter·May 10, 1998SaveLearn
Random-field-driven phase transitions in the ground state of the S=1 XXZ spin chainGround-state of the S=1 XXZ spin chain under the influence of the random magnetic field is studied by means of the exact-diagonalization method. The S=1/2 counterpart has been investigated…Yoshihiro Nishiyama·May 10, 1998SaveLearn
Smoothed Correlators For Symmetric Double-Well Matrix Models: Some Puzzles and ResolutionsSome puzzles which arise in matrix models with multiple cuts are presented. They are present in the smoothed eigenvalue correlators of these models. First a method is described to calculate smoothed…E. Brezin, N. Deo·May 8, 1998SaveLearn
Instanton calculation of the density of states of disordered Peierls chainsWe use the optimal fluctuation method to find the density of electron states inside the pseudogap in disordered Peierls chains. The electrons are described by the one-dimensional Dirac Hamiltonian…Maxim Mostovoy, Jasper Knoester·May 7, 1998SaveLearn
The first principles calculation of transport coefficientsWe demonstrate the practical feasibility of calculating transport coefficients such as the viscosity of liquids completely from first principles using the Green-Kubo relations. Results presented for…Dario Alfe`, Michael J. Gillan·May 7, 1998SaveLearn
On magnetoelastic solitons in ferromagnetWe study the solitonic excitations in the compressible ferromagnetic Heisenberg chain(in the continuum limit).G. N. Nugmanova·May 6, 1998SaveLearn
Quantized vortices and collective oscillations of a trapped Bose condensed gasUsing a sum rule approach we calculate the frequency shifts of the quadrupole oscillations of a harmonically trapped Bose gas due to the presence of a quantized vortex. Analytic results are obtained…Francesca Zambelli, Sandro Stringari·May 6, 1998SaveLearn
Gapless finite-T theory of collective modes of a trapped gasWe present predictions for the frequencies of collective modes of trapped Bose-condensed 87Rb atoms at finite temperature. Our treatment includes a self-consistent treatment of the mean-field…D. A. W. Hutchinson, R. J. Dodd, K. Burnett·May 5, 1998SaveLearn
Spectral shapes of solid neonWe present a Path Integral Monte Carlo calculation of the first three moments of the displacement-displacement correlation functions of solid neon at different temperatures for longitudinal and…Gaia Pedrolli, Alessandro Cuccoli, Alessandro Macchi et al.·May 5, 1998SaveLearn
Optical absorption edge in one-dimensional conductorsThe frequency-dependent conductivity is studied for both the one-dimensional Hubbard model and a model of spinless fermions, using a selection rule, the Bethe ansatz energy eigenstates, and conformal…J. M. P. Carmelo, P. D. Sacramento, N. M. R. Peres et al.·May 5, 1998SaveLearn
The Puzzling Collapse of Electronic Sliding Friction on a Superconductor SurfaceIn a recent paper [Phys. Rev. Lett. 80 (1998) 1690], Krim and coworkers have observed that the friction force, acting on a thin physisorbed layer of N2 sliding on a lead film, abruptly decreases by…B. N. J. Persson, E. Tosatti·May 5, 1998SaveLearn
Factors that Affect the Folding Ability of ProteinsThe folding ability of a heteropolymer model for proteins subject to Monte Carlo dynamics on a simple cubic lattice is shown to be strongly correlated with the energy gap between the native state and…Aaron R. Dinner, Victor Abkevich, Eugene Shakhnovich et al.·May 5, 1998SaveLearn
Superconductor/Insulator Transition in the Striped PhaseWe study the transversal dynamics of a charged stripe (quantum string) at T = 0 and show that its kink excitations play the role of current carriers. If the hopping amplitude t is much smaller…Yu. Dimashko, C. Morais Smith·May 4, 1998SaveLearn
Quantal Brownian Motion - Dephasing and DissipationWe analyze quantal Brownian motion in d dimensions using the unified model for diffusion localization and dissipation, and Feynman-Vernon formalism. At high temperatures the propagator possess a…Doron Cohen·May 3, 1998SaveLearn
Frustrated antiferromagnetic quantum spin chains for spin length S > 1We investigate frustrated antiferromagnetic Heisenberg quantum spin chains at T=0 for S=3/2 and S=2 using the DMRG method. We localize disorder and Lifshitz points, confirming that quantum disorder…R. Roth, U. Schollwoeck·May 2, 1998SaveLearn
Finite Temperature Perturbation Theory for a Spatially Inhomogeneous Bose-condensed GasWe develop a finite temperature perturbation theory (beyond the mean field) for a Bose-condensed gas and calculate temperature-dependent damping rates and energy shifts for Bogolyubov excitations of…P. O. Fedichev, G. V. Shlyapnikov·May 1, 1998SaveLearn
q-Deformed Anisotropic Superexchange Interaction, Frustration and GLpq(2)We study a suitable q-deformed version of the Moriya's superexchange interaction theory by means of its underlying quantum group structure. We show that the one-dimensional chain case is…S. Grillo, H. Montani·May 1, 1998SaveLearn