Artykuł w czasopiśmie
Brak miniatury
Licencja
ClosedAccessDostęp zamknięty
 

Effective potential and quantum criticality for imbalanced Fermi mixtures

Uproszczony widok
dc.abstract.enWe study the analytical structure of the effective action for spin- and mass-imbalanced Fermi mixtures at the onset of the superfluid state. Of our particular focus is the possibility of suppressing the tricritical temperature to zero, so that the transition remains continuous down to T  =  0 and the phase diagram hosts a quantum critical point. At mean-field level we analytically identify such a possibility in a regime of parameters in dimensionality d  =  3. In contrast, in d  =  2 we demonstrate that the occurrence of a quantum critical point is (at the mean-field level) excluded. We show that the Landau expansion of the effective potential remains well-defined in the limit T->0^+ except for a subset of model parameters which includes the standard BCS limit. We calculate the mean-field asymptotic shape of the transition line. Employing the functional renormalization group framework we go beyond the mean field theory and demonstrate the stability of the quantum critical point in d  =  3 with respect to fluctuations.
dc.affiliationUniwersytet Warszawski
dc.contributor.authorZdybel, Piotr
dc.contributor.authorJakubczyk, Paweł
dc.date.accessioned2024-01-24T22:26:32Z
dc.date.available2024-01-24T22:26:32Z
dc.date.issued2018
dc.description.financeNie dotyczy
dc.identifier.doi10.1088/1361-648X/AACC00
dc.identifier.issn0953-8984
dc.identifier.urihttps://repozytorium.uw.edu.pl//handle/item/105760
dc.languageeng
dc.pbn.affiliationphysical sciences
dc.relation.ispartofJournal of Physics Condensed Matter
dc.rightsClosedAccess
dc.sciencecloudnosend
dc.subject.enquantum phase transitions quantum criticality fermionic superfluids renormalization group
dc.titleEffective potential and quantum criticality for imbalanced Fermi mixtures
dc.typeJournalArticle
dspace.entity.typePublication