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Title:Superconductivity in Multi-Band and Disordered Systems
Author(s):Wu, Jiansheng
Doctoral Committee Chair(s):Cooper, S. Lance
Department / Program:Physics
Degree Granting Institution:University of Illinois at Urbana-Champaign
Subject(s):Physics, Low Temperature
Abstract:We propose that a clean array 4He atoms is a self-generated Mott insulator, that is, the 4He atoms constitute the lattice as well as the charge carriers. With this assumption, we are able to interpret the textbook defect-driven supersolids as excitations of either the lower or upper Hubbard bands. In the experiments at hand, disorder induces a closing of the Mott gap through the generation of mid-gap localized states at the chemical potential. Depending on the magnitude of the disorder, we find that the destruction of the Mott state takes place for d + z > 4 either through a Bose glass phase (strong disorder) or through a direct transition to a superfluid (weak disorder). For d + z < 4, disorder is always relevant. The critical value of the disorder that separates these two regimes is shown to be a function of the boson filling, interaction and the momentum cut off. We apply our work to the experimentally observed enhancement 3He impurities has on the onset temperature for the missing moment of inertia. We find quantitative agreement with experimental trends. (Abstract shortened by UMI.).
Issue Date:2009
Description:134 p.
Thesis (Ph.D.)--University of Illinois at Urbana-Champaign, 2009.
Other Identifier(s):(MiAaPQ)AAI3395543
Date Available in IDEALS:2015-09-25
Date Deposited:2009

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