Skip to content

Condensed Matter papers — page 11

cond-matBrowse archive

Creation of discrete solitons and observation of the Peierls-Nabarro barrier in Bose-Einstein Condensates
We analyze the generation and mobility of discrete solitons in Bose-Einstein condensates confined in an optical lattice under realistic experimental conditions. We discuss first the creation of 1D…
V. Ahufinger, A. Sanpera, P. Pedri et al.Oct 2, 2003
Learn
Coulomb gap and variable range hopping in a pinned Wigner crystal
It is shown that pinning of an electron Wigner crystal by a small concentration of charged impurities creates the finite density of charged localized states near the Fermi level. In the case of…
B. I. ShklovskiiOct 2, 2003
Learn
Integrability of a disordered Heisenberg spin-1/2 chain
We investigate how the transition from integrability to nonintegrability occurs by changing the parameters of the Hamiltonian of a Heisenberg spin-1/2 chain with defects. Randomly distributed defects…
L. F. santosOct 2, 2003
Learn
Elastic properties of cellular dissipative structure
Transition towards spatio-temporal chaos in one-dimensional interfacial patterns often involves two degrees of freedom: drift and out-of-phase oscillations of cells, respectively associated to parity…
Philippe Brunet, Jean-Marc Flesselles, Laurent LimatOct 2, 2003
Learn
T' = T, S' = gamma S, P'= gamma2 P, V'= V/gamma, and U' = gamma U
It is shown that the Lorentz invariant temperature T=T and entropy S=γS, pressure P = γ2 P, volume V = V/γ, and energy U = γU,…
Ryszard ZygadłoOct 1, 2003
Learn
Classical and quantum regimes of the superfluid turbulence
We argue that turbulence in superfluids is governed by two dimensionless parameters. One of them is the intrinsic parameter q which characterizes the friction forces acting on a vortex moving with…
G. E. VolovikOct 1, 2003
Learn
Extended temperature tuning of an external cavity diode laser
We describe the construction and operation of an external cavity diode laser in which the diode is cooled to -45 C. This technique allows us to pull the wavelength of a nominally 782 nm diode to…
C. S. Fletcher, J. D. CloseOct 1, 2003
Learn
Open orbits and the semiclassical dwell time
The Wigner delay time is addressed semiclassically using the Miller's S-matrix expressed in terms of open orbits. This leads to a very appealing expression, in terms of classical paths, for the…
Caio H. Lewenkopf, Raul O. VallejosOct 1, 2003
Learn
Composite Fermions and the Fermion-Chern-Simons Theory
The concept of composite fermions, and the related Fermion-Chern-Simons theory, have been powerful tools for understanding quantum Hall systems with a partially full lowest Landau level. We shall…
Bertrand I. HalperinOct 1, 2003
Learn
Geometric effects on T-breaking in p+ip and d+id superconductors
Superconducting order parameters that change phase around the Fermi surface modify Josephson tunneling behavior, as in the phase-sensitive measurements that confirmed d order in the cuprates. This…
Joel E. Moore, Dung-Hai LeeSep 30, 2003
Learn
Angle-resolved photoemission study of USb2: the 5f band structure
Single crystal antiferromagnetic USb2 was studied at 15K by angle-resolved photoemission with an overall energy resolution of 24 meV. The measurements unambiguously show the dispersion of extremely…
E. Guziewicz, T. Durakiewicz, M. T. Butterfield et al.Sep 30, 2003
Learn
High pressure phases in highly piezoelectric Pb(Zr0.52Ti0.48)O3
Two novel room-temperature phase transitions are observed, via synchrotron x-ray diffraction and Raman spectroscopy, in the Pb(Zr0.52Ti0.48)O3 alloy under hydrostatic pressures up to 16 GPa. A…
A. Sani, B. Noheda, I. A. Kornev et al.Sep 30, 2003
Learn
Slow dynamics and local quasi-equilibrium. Relaxation in supercooled colloidal systems
We present a Fokker-Planck description of supercooled colloidal systems exhibiting slow relaxation dynamics. By assuming the existence of a local quasi-equilibrium state during the relaxation of the…
J. M. Rubi, I. Santamaria-Holek, A. Perez-MadridSep 29, 2003
Learn
The Little-Hopfield model on a Random Graph
We study the Hopfield model on a random graph in scaling regimes where the average number of connections per neuron is a finite number and where the spin dynamics is governed by a synchronous…
I. Pérez Castillo, N. S. SkantzosSep 29, 2003
Learn
Dynamics of magnetic moments of a nanoscopic array
Dynamics of nanoscopic arrays of monodomain magnetic elements is simulated by means of the Pardavi-Horvath algorithm. Experimental hysteresis loop is reproduced for the arrays of Ni, with the period…
A. Kaczanowski, K. Malarz, K. KulakowskiSep 29, 2003
Learn
Adiabatic quantum pump in the presence of external ac voltages
We investigate a quantum pump which in addition to its dynamic pump parameters is subject to oscillating external potentials applied to the contacts of the sample. Of interest is the rectification of…
M. Moskalets, M. ButtikerSep 28, 2003
Learn
Semiconservative Replication in the Quasispecies Model
This paper extends Eigen's quasispecies equations to account for the semiconservative nature of DNA replication. We solve the equations in the limit of infinite sequence length for the simplest…
Emmanuel Tannenbaum, Eric J. Deeds, Eugene I. ShakhnovichSep 28, 2003
Learn
The properties of quasispecies dynamics in molecular evolution
We consider the general properties of the quasispecies dynamical system from the standpoint of its evolution and stability. Vector field analysis as well as spectral properties of such system has…
V. V. Gafiychuk, A. K. PrykarpatskySep 28, 2003
Learn
Non-parabolicity of the conduction band of wurtzite GaN
Using cyclotron resonance, we measure the effective mass, m*, of electrons in AlGaN/GaN heterostructures with densities, n2D 1-6×1012cm-2. From our extensive data, we…
S. Syed, J. B. Heroux, Y. J. Wang et al.Sep 27, 2003
Learn
Quantum phase transitions
In recent years, quantum phase transitions have attracted the interest of both theorists and experimentalists in condensed matter physics. These transitions, which are accessed at zero temperature by…
Matthias VojtaSep 26, 2003
Learn
Perturbative Energy Shifts of the Luttinger Liquid Due to the Presence of Additional Dimensions
We consider a system of spinless fermions in a nearly one-dimensional cylindrical trap. We introduce four-fermion interaction terms through which particles in low-lying modes of the trap may interact…
B. AltschulSep 26, 2003
Learn
Diffraction Anomalous Fine Structure spectroscopy at the beamline BM2 at the European Synchrotron Radiation Facility
Diffraction Anomalous Fine Structure (DAFS) spectroscopy uses resonant elastic x-rays scattering as an atomic, shell and site selective probe that gives information on the electronic structure and…
H. Renevier, S. Grenier, S. Arnaud et al.Sep 26, 2003
Learn
Magnetic phases and reorientation transitions in antiferromagnetically coupled multilayers
In antiferromagnetically coupled superlattices grown on (001) faces of cubic substrates, e.g. based on materials combinations as Co/Cu, Fe/Si, Co/Cr, or Fe/Cr, the magnetic states evolve under…
U. K. Roessler, A. N. BogdanovSep 26, 2003
Learn
Study on the formation of MgB2 phase
We report the study of the polycrystalline MgB2 phase formation during the fabrication processes. Three major phases are identified in different sintering temperature ranges according to the…
Qing-rong Feng, Chinping Chen, Jun Xu et al.Sep 26, 2003
Learn
Vortex lattice of a Bose-Einstein Condensate in a rotating anisotropic trap
We study the vortex lattices in a Bose-Einstein Condensate in a rotating anisotropic harmonic trap. We first investigate the single particle wavefunctions obtained by the exact solution of the…
M. O. OktelSep 26, 2003
Learn
← PreviousPage 11Next →