Scaling properties in off equilibrium dynamical processesIn the present paper, we analyze the consequences of scaling hypotheses on dynamic functions, as two times correlations C(t,t'). We show, under general conditions, that C(t,t') must obey…A. Coniglio, M. Nicodemi·Mar 1, 1999SaveLearn
Formation of Ramsey Fringes in Double Bose-Einstein CondensatesNumerical simulations of Ramsey fringe formation in double Bose condensates are carried out in two spatial dimensions. The effects of meanfield nonlinearity and diffusion in the condensates give rise…A. Eschmann, R. J. Ballagh, B. M. Caradoc-Davies·Mar 1, 1999SaveLearn
Magnetoplasmons in quantum ringsWe have studied the structure and dipole charge density response of nanorings as a function of the magnetic field using local-spin density functional theory. Two small rings consisting of 12 and 22…A. Emperador, M. Barranco, E. Lipparini et al.·Feb 26, 1999SaveLearn
Multipole excitations in quantum dotsWe have employed time-dependent local-spin density theory to analyze the multipole spin and charge density excitations recently found in GaAs-AlGaAs quatum dots [C. Schüller et al, Phys. Rev. Lett…A. Emperador, M. Barranco, E. Lipparini et al.·Feb 26, 1999SaveLearn
Domain wall dynamics in soft magnetic materialsThe dynamics of a domain wall in magnetostrictive materials is investigated. The domain wall is modeled by a d-dimensional interface moving in a d+1-dimensional environment. Long-range…Alexei Vazquez, Oscar Sotolongo-Costa·Feb 26, 1999SaveLearn
3D Spinodal Decomposition in the Inertial RegimeWe simulate late-stage coarsening of a 3D symmetric binary fluid using a lattice Boltzmann method. With reduced lengths and times l and t respectively (scales set by viscosity, density and surface…V. M. Kendon, J-C. Desplat, P. Bladon et al.·Feb 25, 1999SaveLearn
On the localization of random heteropolymers at the interface between two selective solventsTo study the localization of random heteropolymers at an interface separating two selective solvents within the model of Garel, Huse, Leibler and Orland, Europhys. Lett. 8 9 (1989), we propose…Cecile Monthus·Feb 25, 1999SaveLearn
Microscopic theory of vortex dynamics in homogeneous superconductorsVortex dynamics in fermionic superfluids is carefully considered from the microscopic point of view. Finite temperatures, as well as impurities, are explicitly incorporated. To enable readers…P. Ao, X. -M. Zhu·Feb 25, 1999SaveLearn
Practical Methods for Ab Initio Calculations on Thousands of AtomsWe describe recent progress in developing practical ab initio methods for which the computer effort is proportional to the number of atoms: linear scaling or O(N) methods. It is shown that the…D. R. Bowler, I. J. Bush, M. J. Gillan·Feb 25, 1999SaveLearn
Remnant Fermi surface in the presence of an underlying instability in layered 1T-TaS2We report high resolution angle-scanned photoemission and Fermi surface (FS) mapping experiments on the layered transition-metal dichalcogenide 1T-TaS2 in the quasi commensurate (QC) and the…Th. Pillo, J. Hayoz, H. Berger et al.·Feb 24, 1999SaveLearn
Statistical Mechanics of Charged Polymers in Electrolyte Solutions: A Lattice Field Theory ApproachThe lattice field theory approach to the statistical mechanics of a classical Coulomb gas [R. Coalson and A. Duncan, J. Chem. Phys. 97,5653(1992)] is generalized to include charged polymer chains.…R. D. Coalson, A. Duncan, S. Tsonchev·Feb 24, 1999SaveLearn
Correlations of Eigenvectors for Non-Hermitian Random-Matrix ModelsWe establish a general relation between the diagonal correlator of eigenvectors and the spectral Green's function for non-hermitian random-matrix models in the large-N limit. We apply this result…R. A. Janik, W. Noerenberg, M. A. Nowak et al.·Feb 23, 1999SaveLearn
The Role of the Carrier Mass in Semiconductor Quantum DotsIn the present work we undertake a re-examination of effective mass theory (EMT) for a semiconductor quantum dot. We take into account the fact that the effective mass (mi) of the carrier inside…M. S. Chhabra, V. Ranjan, Vijay A. Singh·Feb 23, 1999SaveLearn
Nonlinear Quantum CapacitanceWe analyze the nonlinear voltage dependence of elelctrochemical capacitance for nano-scale conductors. This voltage dependence is due to finite density of states of the conductors. We derive an exact…Baigeng Wang, Xuean Zhao, Jian Wang et al.·Feb 23, 1999SaveLearn
Nonlinear I-V Characteristics of a Mesoscopic ConductorWe present a general theoretical formulation, based on nonequilibrium Green's functions, for nonlinear DC transport in multi-probe mesoscopic conductors. The theory is gauge invariant and is…Baigeng Wang, Jian Wang, Hong Guo·Feb 23, 1999SaveLearn
Nonlinear voltage dependence of shot noiseThe current noise in a multi-probe mesoscopic conductor can have a nonlinear dependence on the strength of driving bias voltage. This paper presents a theoretical formulation for the nonlinear noise…Yadong Wei, Baigeng Wang, Jian Wang et al.·Feb 23, 1999SaveLearn
Quantum optics of a Bose-Einstein condensate coupled to a quantized light fieldWe consider the interaction between a Bose-Einstein condensate and a single-mode quantized light field in the presence of a strong far off-resonant pump laser. The dynamics is characterized by an…M. G. Moore, O. Zobay, P. Meystre·Feb 23, 1999SaveLearn
Quantum tunneling across spin domains in a Bose-Einstein condensateQuantum tunneling was observed in the decay of metastable spin domains in gaseous Bose-Einstein condensates. A mean-field description of the tunneling was developed and compared with measurement. The…D. M. Stamper-Kurn, H. -J. Miesner, A. P. Chikkatur et al.·Feb 22, 1999SaveLearn
Monte Carlo energy and variance minimization techniques for optimizing many-body wave functionsWe investigate Monte Carlo energy and variance minimization techniques for optimizing many-body wave functions. Several variants of the basic techniques are studied, including limiting the variations…P. R. C. Kent, R. J. Needs, G. Rajagopal·Feb 22, 1999SaveLearn
Evaluating the partition function for systems with long range interactionsWe express the partition function for an equilibrium system of interacting particles in the canonical ensemble as a functional integration over the particles' density field. We outline a method…Tong Zhou·Feb 19, 1999SaveLearn
A Two-dimensional Infinte System Density Matrix Renormalization Group AlgorithmIt has proved difficult to extend the density matrix renormalization group technique to large two-dimensional systems. In this Communication I present a novel approach where the calculation is done…Patrik Henelius·Feb 19, 1999SaveLearn
Improving the Efficiency of FP-LAPW CalculationsThe full-potential linearized augmented-plane wave (FP-LAPW) method is well known to enable most accurate calculations of the electronic structure and magnetic properties of crystals and surfaces.…Max Petersen, Frank Wagner, Lars Hufnagel et al.·Feb 19, 1999SaveLearn
Quantum Spinodal Decomposition in Multicomponent Bose-Einstein CondensatesWe investigate analytically the non-equilibrium spatial phase segregation process of a mixture of alkali Bose-Einstein condensates. Two stages (I and II) are found in analogy to the classical…S. T. Chui, P. Ao·Feb 19, 1999SaveLearn
Coherent Polariton Radiation and Light LocalizationA system of resonance atoms is placed in a medium with developed polariton effect. In the spectrum of polariton states there can exist a band gap. If an atom with a resonance frequency inside the…V. I. Yukalov·Feb 18, 1999SaveLearn
One and Two Dimensional Spin Systems in the Regime Close to Deconfinement of SpinonsBased on the Majumdar-Ghosh chain we construct several spin models which allow us to investigate spinon dynamics in the regime close to deconfinement of spinons. We consider the J1 - J2 - δmodel,…T. M. R. Byrnes, M. T. Murphy, O. P. Sushkov·Feb 18, 1999SaveLearn