Title:
BCS to BEC Evolution and Quantum Phase Transitions in Superfluid Fermi Gases

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dc.contributor.advisor Sá de Melo, Carlos A. R.
dc.contributor.author Iskin, Menderes en_US
dc.contributor.committeeMember Zangwill, Andrew
dc.contributor.committeeMember David S. Citrin
dc.contributor.committeeMember Chapman, Michael
dc.contributor.committeeMember T. A. Brian Kennedy
dc.contributor.department Physics en_US
dc.date.accessioned 2007-08-16T18:00:34Z
dc.date.available 2007-08-16T18:00:34Z
dc.date.issued 2007-06-29 en_US
dc.description.abstract This thesis focuses on the analysis of Bardeen-Cooper-Schrieffer (BCS) to Bose-Einstein condensation (BEC) evolution in ultracold superfluid Fermi gases when the interaction between atoms is varied. The tuning of attractive interactions permits the ground state of the system to evolve from a weak fermion attraction BCS limit of loosely bound and largely overlapping Cooper pairs to a strong fermion attraction limit of tightly bound small bosonic molecules which undergo BEC. This evolution is accompanied by anomalous behavior of many superfluid properties, and reveals several quantum phase transitions. This thesis has two parts: In the first part, I analyze zero and nonzero orbital angular momentum pairing effects, and show that a quantum phase transition occurs for nonzero angular momentum pairing, unlike the $s$-wave case where the BCS to BEC evolution is just a crossover. In the second part, I analyze two-species fermion mixtures with mass and population imbalance in continuum, trap and lattice models. In contrast with the crossover physics found in the mass and population balanced mixtures, I demonstrate the existence of phase transitions between normal and superfluid phases, as well as phase separation between superfluid (paired) and normal (excess) fermions in imbalanced mixtures as a function of scattering parameter and mass and population imbalance. en_US
dc.description.degree Ph.D. en_US
dc.identifier.uri http://hdl.handle.net/1853/16326
dc.publisher Georgia Institute of Technology en_US
dc.subject Fermi gas en_US
dc.subject Ultracold en_US
dc.subject Quantum phase transition en_US
dc.subject BEC en_US
dc.subject BCS en_US
dc.subject Crossover en_US
dc.subject BCS-BEC en_US
dc.title BCS to BEC Evolution and Quantum Phase Transitions in Superfluid Fermi Gases en_US
dc.type Text
dc.type.genre Dissertation
dspace.entity.type Publication
local.contributor.advisor Sá de Melo, Carlos A. R.
local.contributor.corporatename College of Sciences
local.contributor.corporatename School of Physics
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relation.isOrgUnitOfPublication 85042be6-2d68-4e07-b384-e1f908fae48a
relation.isOrgUnitOfPublication 2ba39017-11f1-40f4-9bc5-66f17b8f1539
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