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Superfluidity near localization: supersolid and superglass

  • Author / Creator
    Dang, Long
  • The main theme of this thesis is the interplay between superfluidity and localization,
    in a system of strongly correlated Bose particles. Driving this investigation is the search
    for yet unobserved phases of matter, such as the so-called supersolid. Using state-of-the-
    art, numerically exact computer simulations, we have carried out an extensive theoretical
    investigation of the effects of long-range interactions, inhomogeneity, disorder and frustration in a simple model of lattice Bosons. In particular, we explore the scenario of
    vacancy- and interstitial-based supersolid phases of hard core bosons on a square lattice,
    interacting repulsively via a nearest-neighbour and next-nearest neighbour potential. Secondly, in an attempt to model the physics of a layer of helium adsorbed on a corrugated
    substrate, an additional superlattice of the absorption sites is imposed to the system of
    hard core bosons, and the resulting low temperature phase diagram is studied. Finally,
    the possibility of actually inducing by disorder superfluidity (superglass) in a system that
    does not display it in the absence of disorder is demonstrated. The quantitative and qual-
    itative predictions at which we have arrived appear to be at least in principle testable
    experimentally, for example by performing measurements on ultracold atoms in optical
    lattices.

  • Subjects / Keywords
  • Graduation date
    Fall 2010
  • Type of Item
    Thesis
  • Degree
    Doctor of Philosophy
  • DOI
    https://doi.org/10.7939/R3TW4S
  • License
    This thesis is made available by the University of Alberta Libraries with permission of the copyright owner solely for non-commercial purposes. This thesis, or any portion thereof, may not otherwise be copied or reproduced without the written consent of the copyright owner, except to the extent permitted by Canadian copyright law.
  • Language
    English
  • Institution
    University of Alberta
  • Degree level
    Doctoral
  • Department
  • Supervisor / co-supervisor and their department(s)
  • Examining committee members and their departments
    • Alex Brown (Chemistry)
    • Mona Berciu (Physics), University of British Columbia
    • Kevin Beach (Physics)
    • Craig Heinke, Physics)
    • Mauricio Sacchi (Physics)