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dc.contributor.authorFoo, Darrylen
dc.date.accessioned2021-03-24T10:56:37Z
dc.date.available2021-03-24T10:56:37Z
dc.date.submitted2020-08-01en
dc.identifier.urihttps://www.repository.cam.ac.uk/handle/1810/319139
dc.description.abstractWeak attractive interactions in a spin-balanced fermion gas are known to induce a Cooper pairing instability where the fermion pairs have zero net momentum, leading to BCS superconductivity. Extensions for spin-imbalanced systems include breached superfluids, Fulde–Ferrell–Larkin–Ovchinnikov theory, and pair density wave theory. We propose a further extension of a superconducting state, dubbed a communal pairing state, whose underlying components are superpositions of Cooper pairs that share minority-spin fermions. This state includes correlations between all available fermions on both Fermi surfaces and is shown to be energetically favourable to the Fulde-Ferrell-Larkin-Ovchinnikov state. Our numerical quantum Monte Carlo study of finite spin-imbalanced systems provides clear evidence of the existence of such exotic pairing states. In spin-balanced systems, temporal fluctuations of the order parameter promote communal pairing, leading to a widening in momentum space of the superconducting gap and a decrease of the chemical potential.en
dc.rightsAttribution 4.0 Internationalen
dc.rightsAttribution 4.0 Internationalen
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/en
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/en
dc.subjectSuperconductorsen
dc.subjectFermi gasesen
dc.subjectComputational physicsen
dc.titleCommunal pairing in Fermi gases with attractive interactionsen
dc.typeThesis
dc.type.qualificationlevelDoctoralen
dc.type.qualificationnameDoctor of Philosophy (PhD)en
dc.publisher.institutionUniversity of Cambridgeen
dc.identifier.doi10.17863/CAM.66258
rioxxterms.licenseref.urihttp://www.rioxx.net/licenses/all-rights-reserveden
dc.contributor.orcidFoo, Darryl [0000-0001-7565-1383]
rioxxterms.typeThesisen
dc.type.qualificationtitlePhD in Physicsen
cam.supervisorConduit, Gareth


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Attribution 4.0 International
Except where otherwise noted, this item's licence is described as Attribution 4.0 International