Studies of strongly-correlated fermions in an optical lattice
Morong, William Nathan
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https://hdl.handle.net/2142/106150
Description
Title
Studies of strongly-correlated fermions in an optical lattice
Author(s)
Morong, William Nathan
Issue Date
2019-09-06
Director of Research (if dissertation) or Advisor (if thesis)
DeMarco, Brian
Doctoral Committee Chair(s)
Gadway, Bryce
Committee Member(s)
Mason, Nadya
Scarola, Vito
Department of Study
Physics
Discipline
Physics
Degree Granting Institution
University of Illinois at Urbana-Champaign
Degree Name
Ph.D.
Degree Level
Dissertation
Keyword(s)
atomic physics
ultracold atoms
optical lattice
strong correlations
Abstract
Ultracold fermionic atoms in a disordered optical lattice can realize the disordered Fermi-Hubbard model, allowing investigations of the nature of strongly-correlated fermions in a minimal setting. This thesis describes two such studies. In the first, we observe the momentum relaxation of strongly-correlated fermions in the absence of disorder. We find a violation of the weak-scattering prediction for the scaling with temperature, which is analogous to the linear-in-temperature scaling of resistivity in substances called ``bad metals.'' In the second, we probe a disordered and strongly-correlated system using quenches of the interaction strength that take it far from equilibrium. We find that the relaxation of double occupancies following the quenches has distinct dynamical regimes controlled by the interplay of interactions and disorder. We present a minimal picture of the relaxation process that illustrates the origin of these regimes, which are related to the Mott--metal--Anderson transitions of the ground state at half-filling.
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