Phase diagram of quasi-two-dimensional bosons in laser speckle potential
arXiv:1211.7031 · doi:10.1103/PhysRevA.87.061601
Abstract
We have studied the phase diagram of a quasi-two-dimensional interacting Bose gas at zero temperature in the presence of random potential created by laser speckles. The superfluid fraction and the fraction of particles with zero momentum are obtained within the mean-field Gross-Pitaevskii theory and in diffusion Monte Carlo simulations. We find a transition from the superfluid to the insulating state, when the strength of the disorder grows. Estimations of the critical parameters are compared with the predictions of the percolation theory in the Thomas-Fermi approximation. Analytical expressions for the zero-momentum fraction and the superfluid fraction are derived in the limit of weak disorder and weak interactions within the framework of the Bogoliubov theory. Limits of validity of various approximations are discussed.
5 pages, 4 figures; v2 - published version
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- Josephson relation for disordered superfluids
- Superfluid-insulator transition of two-dimensional disordered Bose gases
- Superfluid fraction of interacting bosonic gases
- Bogoliubov approach to superfluid-Bose glass phase transition of a disordered Bose-Hubbard Model in weakly interacting regime
- Localization landscape for interacting Bose gases in one-dimensional speckle potentials
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