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Title:Disordered insulator in an optical lattice
Author(s):Pasienski, Matthew J.
Director of Research:DeMarco, Brian L.
Doctoral Committee Chair(s):Lev, Benjamin L.
Doctoral Committee Member(s):DeMarco, Brian L.; Ceperley, David M.; Clegg, Robert M.
Department / Program:Physics
Degree Granting Institution:University of Illinois at Urbana-Champaign
Subject(s):Optical Lattice
Atomic Physics
Digital Holography
Abstract:We experimentally studied the transport properties of ultracold bosonic atoms trapped in a disordered optical lattice|a system described by the disordered Bose-Hubbard model, which is a paradigm important to condensed matter physics. The disorder is created using a controllable and completely characterized ne-grained optical speckle eld that is superimposed on 87Rb atoms con ned in a three-dimensional lattice in the strongly correlated regime. We discovered that above a critical disorder strength, the gas of atoms transforms from a super uid to a disordered insulator. We compare our results to recent quantum Monte-Carlo numerical simulations of this model. Finally, I present an algorithm we invented that allows the pro le of laser beams to be shaped holographically into arbitrary intensity patterns suitable for trapping ultracold atoms.
Issue Date:2011-08-25
Rights Information:Copyright 2011 Matthew J. Pasienski
Date Available in IDEALS:2011-08-25
Date Deposited:2011-08

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