2026-09-19T16:26:11Zhttps://ecommons.cornell.edu/server/oai/requestoai:ecommons.cornell.edu:1813/568462026-05-15T19:48:02Zcom_1813_35col_1813_47
Reichl, Matthew Douglas
Mueller, Erich
Ginsparg, Paul Henry
Parpia, Jeevak M.
2018-04-26T14:16:46Z
2018-04-26T14:16:46Z
2017-08-30
ProQuest Submission ID: 10322
ProQuest Publication ID: 10288298
https://hdl.handle.net/1813/56846
https://doi.org/10.7298/X4CF9N7K
10361523
This thesis presents a series of theoretical studies of ultra cold atomic systems which model and propose experiments, and develop new computational techniques in order to elucidate aspects of many-body physics and non-equilibrium dynamics. In the first two studies I model the dynamics of nonlinear solitonic excitations in ultracold fermionic superfluids: the first simulates recent experiments and supports the hypothesis that the solitons generated in those experiments are unstable to the formation of vortex rings; the second demonstrates how population imbalance between up and down spin fermions can be used to prevent this instability. In the next study I discuss a method for generating and probing topologically protected edge states using periodically driven optical lattices potentials. Next I use a perturbative approach to study the spectral density of fermions with strong attractive interactions in the normal phase. After that I develop a novel cluster expansion technique to model the dynamics of interacting fermions in a disordered optical lattice. Finally I apply a Ginzurg-Landau theory to model experimental studies of superfluid 3He embedded in nematically ordered aerogel, finding evidence for a new phase of matter --the ``polar phase"-- which is not seen in bulk 3He.
en_US
Physics
Atomic physics
Condensed matter physics
Many-body physics and non-equilibrium dynamics in ultracold atomic systems
dissertation or thesis
application/pdf
Physics
Cornell University
Doctor of Philosophy
Ph. D., Physics
https://hdl.handle.net/1813/59810
Publication
Cornell Theses and Dissertations
Reichl, Matthew Douglas
5893a6ea-7af3-41d7-abc6-04bcd26ab5df
open.access
open.access
<Publication xmlns="https://www.openaire.eu/cerif-profile/1.1/" id="0ac43f6b-6c19-4e12-879d-0a128c5e9614">
<Type xmlns="https://www.openaire.eu/cerif-profile/vocab/COAR_Publication_Types">http://purl.org/coar/resource_type/c_1843</Type>
<Language>en_US</Language>
<Title>Many-body physics and non-equilibrium dynamics in ultracold atomic systems</Title>
<PublishedIn>
<Publication>
</Publication>
</PublishedIn>
<PublicationDate>2017-08-30</PublicationDate>
<DOI>https://doi.org/10.7298/X4CF9N7K</DOI>
<Authors>
<Author>
<DisplayName>Reichl, Matthew Douglas</DisplayName>
<Affiliation>
<OrgUnit>
</OrgUnit>
</Affiliation>
</Author>
</Authors>
<Editors>
</Editors>
<Publishers>
<Publisher>
<OrgUnit />
</Publisher>
</Publishers>
<Keyword>Physics</Keyword>
<Keyword>Atomic physics</Keyword>
<Keyword>Condensed matter physics</Keyword>
<Abstract>This thesis presents a series of theoretical studies of ultra cold atomic systems which model and propose experiments, and develop new computational techniques in order to elucidate aspects of many-body physics and non-equilibrium dynamics. In the first two studies I model the dynamics of nonlinear solitonic excitations in ultracold fermionic superfluids: the first simulates recent experiments and supports the hypothesis that the solitons generated in those experiments are unstable to the formation of vortex rings; the second demonstrates how population imbalance between up and down spin fermions can be used to prevent this instability. In the next study I discuss a method for generating and probing topologically protected edge states using periodically driven optical lattices potentials. Next I use a perturbative approach to study the spectral density of fermions with strong attractive interactions in the normal phase. After that I develop a novel cluster expansion technique to model the dynamics of interacting fermions in a disordered optical lattice. Finally I apply a Ginzurg-Landau theory to model experimental studies of superfluid 3He embedded in nematically ordered aerogel, finding evidence for a new phase of matter --the ``polar phase"-- which is not seen in bulk 3He.</Abstract>
<Access xmlns="http://purl.org/coar/access_right"
>
</Access>
</Publication>