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Title:
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Phase diagram of quasi-two-dimensional bosons in a laser-speckle potential
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Author:
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Astrakharchik, Grigori; Krutitsky, K.V.; Navez, Patrick
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Other authors:
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Universitat Politècnica de Catalunya. Departament de Física; Universitat Politècnica de Catalunya. SIMCON - Grup de Recerca de Simulació per Ordinador en Matèria Condensada |
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Abstract:
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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. |
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Abstract:
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Peer Reviewed |
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Subject(s):
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-Àrees temàtiques de la UPC::Física::Física de partícules
-Bosons--Mathematical models
-Two dimensional
-Monte Carlo methods
-Phase diagrams Speckle
-Bosons -- Models matemàtics |
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Rights:
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Document type:
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Article - Submitted version
Article |
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