Signatures of the BCS-BEC crossover in the yrast spectra of Fermi quantum rings

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dc.citation.issue2
dc.citation.volume3
dc.contributor.authorEbling U
dc.contributor.authorAlavi A
dc.contributor.authorBrand J
dc.date.accessioned2023-11-29T22:54:19Z
dc.date.accessioned2024-07-25T06:42:05Z
dc.date.available2023-11-29T22:54:19Z
dc.date.available2024-07-25T06:42:05Z
dc.date.issued2021-05
dc.description.abstractWe study properties of the lowest energy states at nonzero total momentum (yrast states) of the Hubbard model for spin-½ fermions in the quantum ring configuration with attractive on-site interaction at low density. In the one-dimensional (1D) case we solve the Hubbard model using the Bethe ansatz, while for the crossover into the 2D regime we use the Full-Configuration-Interaction Quantum Monte Carlo method to obtain the yrast states for the spin-balanced Fermi system. We show how the yrast excitation spectrum changes from the 1D to the 2D regime and how pairing affects the yrast spectra. We also find signatures of fragmented condensation for certain yrast states usually associated with dark solitons.
dc.identifier.citationEbling U, Alavi A, Brand J. (2021). Signatures of the BCS-BEC crossover in the yrast spectra of Fermi quantum rings. Physical Review Research. 3. 2.
dc.identifier.doi10.1103/PhysRevResearch.3.023142
dc.identifier.elements-typejournal-article
dc.identifier.issn2643-1564
dc.identifier.urihttps://mro.massey.ac.nz/handle/10179/70710
dc.publisherAmerican Physical Society
dc.relation.isPartOfPhysical Review Research
dc.rightsCC BY 4.0
dc.rights.urihttps://creativecommons.org/licenses/by/4.0/
dc.titleSignatures of the BCS-BEC crossover in the yrast spectra of Fermi quantum rings
dc.typeJournal article
pubs.elements-id448793
pubs.organisational-groupOther
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