Quasi-localization and quasi-mobility edge for light atoms mixed with heavy ones

  title={Quasi-localization and quasi-mobility edge for light atoms mixed with heavy ones},
  author={Eugene Kogan},
  journal={The European Physical Journal B},
  • E. Kogan
  • Published 5 June 2007
  • Physics
  • The European Physical Journal B
Abstract.A mixture of light and heavy atoms is considered. We study the kinetics of the light atoms, scattered by the heavy ones, the latter undergoing slow diffusive motion. In three-dimensional space we claim the existence of a crossover region (in energy), which separates the states of the light atoms with fast diffusion and the states with slow diffusion; the latter is determined by the dephasing time. For the two dimensional case we have a transition between weak localization, observed… Expand
3 Citations

Figures from this paper

Single-particle localization in dynamical potentials
Single particle localization of an ultra-cold atom is studied in one dimension when the atom is confined by an optical lattice and by the incommensurate potential of a high-finesse optical cavity. InExpand
Transport in a disordered tight-binding chain with dephasing
We studied transport properties of a disordered tight-binding model (XX spin chain) in the presence of dephasing. Focusing on diffusive behaviour in the thermodynamic limit at high energies, weExpand
Quantum diffusion of matter waves in 2D speckle potentials
This paper investigates quantum diffusion of matter waves in two-dimensional random potentials, focussing on expanding Bose-Einstein condensates in spatially correlated optical speckle potentials.Expand


Disorder physics in mixtures of fermionic atoms
A mixture of light and heavy fermionic atoms in an optical lattice is considered. Tunneling of the heavy atoms is neglected such that they are only subject to thermal fluctuations. There is a complexExpand
Three-dimensional strong localization of matter waves by scattering from atoms in a lattice with a confinement-induced resonance
The possibility of using ultracold atoms to observe strong localization of matter waves is now a subject of great interest, as undesirable decoherence and interactions can be made negligible in theseExpand
Matter-wave localization in disordered cold atom lattices.
We propose to observe Anderson localization of ultracold atoms in the presence of a random potential made of atoms of another species or spin state and trapped at the nodes of an optical lattice,Expand
Localization of matter waves in two-dimensional disordered optical potentials.
The diffusion constant is derived as a function of all relevant microscopic parameters and it is shown that coherent multiple scattering induces significant weak localization effects. Expand
Localization of bosonic atoms by fermionic impurities in a three-dimensional optical lattice.
The observed shift is larger than expected based on a simple mean-field argument, which indicates that disorder-related effects play a significant role in the transition parameter. Expand
Weak localization: The quasiclassical theory of electrons in a random potential
Abstract The recent subject of weak localization is an important area of research in condensed matter physics which has received a considerable amount of experimental and theoretical attention. InExpand
Localization and dephasing driven by magnetic fluctuations in low carrier density colossal magnetoresistance materials
Abstract:Localization and dephasing of conduction electrons in a low carrier density ferromagnet due to scattering on magnetic fluctuations is considered. We claim the existence of the “mobilityExpand
Electron localization and hopping conductivity in one-dimensional disordered systems
Abstract All electron states in one-dimensional disordered lattices are localized due to strong interference effects. We discuss this phenomenon, which was firstly predicted by Mott and Twose inExpand
Interacting electrons in disordered wires: Anderson localization and low-T transport.
The conductivity sigma(T) of interacting electrons in a low-dimensional disordered system at low temperature T is studied, finding the mechanism of transport in the critical regime is many-particle transitions between distant states in Fock space. Expand
Routes towards Anderson-like localization of Bose-Einstein condensates in disordered optical lattices.
Analysis of possible routes towards Anderson-like localization of Bose-Einstein condensates in disordered potentials shows that incommensurable superlattices should allow for the observation of the crossover from the nonlinear screening regime to the Anderson localized case within realistic experimental parameters. Expand