Far-infrared spectroscopy of nanoscopic InAs ringsWe have employed time-dependent local-spin density theory to analyze the far-infrared transmission spectrum of InAs self-assembled nano-rings recently reported [A. Lorke et al, cond-mat/9908263…Agusti Emperador, Marti Pi, Manuel Barranco et al.·Nov 9, 1999SaveLearn
Rotation in an asymmetric multidimensional periodic potential due to colored noiseWe analyze the motion of an overdamped classical particle in a multidimensional periodic potential, driven by a weak external noise. We demonstrate that in steady-state, the presence of temporal…A. W. Ghosh, S. V. Khare·Nov 9, 1999SaveLearn
Internal Friction of Amorphous Silicon in a Magnetic FieldThe internal friction of e-beam amorphous silicon was measured in a magnetic field between 0 and 6 T, from 1.5-20 K, and was found to be independent of the field to better than 8%. It is concluded…T. H. Metcalf, Xiao Liu, R. O. Pohl·Nov 8, 1999SaveLearn
Nonlinear conduction of sliding electronic crystals: Charge and Spin Density WavesA model of local metastable states due to the pinning induces plastic deformations allows to describe the nonlinear I-V curves in sliding density waves -DW. With increasing the DW velocity v, the…S. Brazovskii, A. Larkin·Nov 7, 1999SaveLearn
X-Ray Diffraction from Pinned Charge Density WavesWe present an x-ray study of doped charge density waves systems. When a 2kf-charge density wave is strongly pinned to impurities, an interference effect gives rise to an asymmetry between the…S. Rouziere, S. Ravy, S. Brazovskii et al.·Nov 6, 1999SaveLearn
Zero-temperature phase diagram of binary boson-fermion mixturesWe calculate the phase diagram for dilute mixtures of bosons and fermions at zero temperature. The linear stability conditions are derived and related to the effective boson-induced interaction…L. Viverit, C. J. Pethick, H. Smith·Nov 5, 1999SaveLearn
Cosmology in a Test Tube: Theory of Domain Walls Formation in Binary FluidsFormation of domain walls during a rapid phase transition in a quasi one dimensional Cahn-Hiliard equation describing binary fluids in a thin tube is studied. Density of kinks scales like a sixth…Jacek Dziarmaga, Mariusz Sadzikowski·Nov 5, 1999SaveLearn
Sound attenuation in the superconducting amorphous alloy ZrTiCuNiBeThe superconducting energy gap and the parameter of the intensity of electron scattering at two-level systems in amorphous ZrTiCuNiBe are determined from the results of measurements of sound…E. V. Bezuglyi, A. L. Gaiduk, V. D. Fil et al.·Nov 3, 1999SaveLearn
Polarization and localization in insulators: generating function approachWe develop the theory and practical expressions for the full quantum-mechanical distribution of the intrinsic macroscopic polarization of an insulator in terms of the ground state wavefunction. The…Ivo Souza, Tim Wilkens, Richard M. Martin·Nov 2, 1999SaveLearn
Shifts and widths of collective excitations in trapped Bose gases by the dielectric formalismWe present predictions for the temperature dependent shifts and damping rates. They are obtained by applying the dielectric formalism to a simple model of a trapped Bose gas. Within the framework of…J. Reidl, A. Csordás, R. Graham et al.·Nov 2, 1999SaveLearn
Evaporative Cooling of a Two-Component Degenerate Fermi GasWe derive a quantum theory of evaporative cooling for a degenerate Fermi gas with two constituents and show that the optimum cooling trajectory is influenced significantly by the quantum statistics…M. J. Holland, B. DeMarco, D. S. Jin·Nov 2, 1999SaveLearn
Effect of transport coefficients on the time-dependence of density matrixFor Lindblad's master equation of open quantum systems with a general quadratic form of the Hamiltonian, the propagator of the density matrix is analytically calculated by using path integral…Yu. V. Palchikov, G. G. Adamian, N. V. Antonenko et al.·Nov 2, 1999SaveLearn
Renormalization Group Approach to the Problem of Flow Through Irregular Packed BedsWe have calculated the asymptotics of Green's function of the differential equation of nonlinear diffusion in the microscopic range with strong porosity fluctuations in the problem of flow…Dmitri Volchenkov, Ricardo Lima·Nov 2, 1999SaveLearn
Conformation changes and folding of proteins mediated by Davidov's solitonWe suggest that Davidov's solitons, propagating through the backbone of a protein, can mediate conformational transition and folding of a protein to its native state. A simple toy model is…Shay Caspi, Eshel Ben-Jacob·Nov 2, 1999SaveLearn
Instance Space of the Number Partitioning ProblemWithin the replica framework we study analytically the instance space of the number partitioning problem. This classic integer programming problem consists of partitioning a sequence of N positive…F. F. Ferreira, J. F. Fontanari·Nov 1, 1999SaveLearn
Andreev Spectroscopy for Superconducting Phase QubitsWe propose a new method to measure the coherence time of superconducting phase qubits based on the analysis of the magnetic-field dependent dc nonlinear Andreev current across a high-resistance…Mikhail V. Feigel'man, Lev B. Ioffe, Vadim B. Geshkenbein et al.·Oct 31, 1999SaveLearn
Operator-valued Riemann-Hilbert problem for correlation functions of the XXZ spin chainThe generating functional of correlation functions for the XXZ spin chain is considered in the thermodynamic limit. We derive a system of integro-difference equations that prescribe this functional.…Yasuhiro Fujii, Miki Wadati·Oct 30, 1999SaveLearn
How localized is an extended quantum system ?We elaborate on a geometric characterization of the electromagnetic properties of matter. A fundamental complex quantity, zL, is introduced to study the localization properties of extended quantum…G. Ortiz, A. A. Aligia·Oct 29, 1999SaveLearn
Dark Solitons in Bose-Einstein CondensatesDark solitons in cigar shaped Bose-Einstein condensates of Rubidium-87 are created by a phase imprinting method. Coherent and dissipative dynamics of the solitons has been observed.S. Burger, K. Bongs, S. Dettmer et al.·Oct 29, 1999SaveLearn
Inequivalence of Dynamical Ensembles in a Generalised Driven Diffusive Lattice GasWe generalise the Driven Diffusive Lattice Gas (DDLG) model by using a combination of Kawasaki and Glauber dynamics. We find via Monte Carlo simulations and perturbation studies that the simplest…Muktish Acharyya, Abhik Basu, Rahul Pandit et al.·Oct 29, 1999SaveLearn
Macroscopic Dielectric Constant for Microstructures of Sedimentary RocksAn approximate method to calculate dielectric response and relaxation functions for water saturated sedimentary rocks is tested for realistic threedimensional pore space images. The test is performed…R. Hilfer, J. Widjajakusuma, B. Biswal·Oct 29, 1999SaveLearn
Density Matrix RenormalizationThe Density Matrix Renormalization Group (DMRG) has become a powerful numerical method that can be applied to low-dimensional strongly correlated fermionic and bosonic systems. It allows for a very…Karen Hallberg·Oct 29, 1999SaveLearn
Conditions on the Occurrence of Magnetic Moments in Quasicrystals and Related PhasesWe analyze the criterion for the appearance of magnetic moments in quasicrystals approximants and liquids Al-Mn. In a Hartree-Fock scheme, it is shown that the Stoner criterion (Und(EF) > 1) does…Guy Trambly de Laissardiere, Didier Mayou·Oct 28, 1999SaveLearn
Decay properties of the density matrix and Wannier functions for interacting systemsFor non-interacting electrons the one-particle density matrix and the related Wannier functions characterize a material as insulating or metallic. Introducing many-body Wannier functions, we show…S. Goedecker, E. Koch·Oct 28, 1999SaveLearn
On Matrix Product States for Periodic Boundary ConditionsThe possibility of a matrix product representation for eigenstates with energy and momentum zero of a general m-state quantum spin Hamiltonian with nearest neighbour interaction and periodic boundary…Klaus Krebs·Oct 27, 1999SaveLearn