Dimensional crossover in ultracold Fermi gases from functional renormalization

• Verfasst von: Faigle-Cedzich, Bruno M. [VerfasserIn]
• Verfasst von: Pawlowski, Jan M. [VerfasserIn]
• Verfasst von: Wetterich, Christof [VerfasserIn]
• Titel: Dimensional crossover in ultracold Fermi gases from functional renormalization
• Verf.angabe: Bruno M. Faigle-Cedzich, Jan M. Pawlowski, and Christof Wetterich
• E-Jahr: 2021
• Jahr: 22 March 2021
• Umfang: 19 S.
• Fussnoten: Gesehen am 17.06.2021
• Titel Quelle: Enthalten in: Physical review
• Ort Quelle: Woodbury, NY : Inst., 2016
• Jahr Quelle: 2021
• Band/Heft Quelle: 103(2021), 3 vom: März, Artikel-ID 033320, Seite 1-19
• ISSN Quelle: 2469-9934
• DOI: doi:10.1103/PhysRevA.103.033320
• Datenträger: Online-Ressource
• Sprache: eng
• K10plus-PPN: 1760688622

Abstract

We investigate the dimensional crossover from three to two dimensions in an ultracold Fermi gas across the whole BCS-BEC crossover. Of particular interest is the strongly interacting regime as strong correlations and pair fluctuations are more pronounced in reduced dimensions. Our results are obtained from first principles within the framework of the functional renormalization group (FRG). Here, the confinement of the transverse direction is imposed by means of periodic boundary conditions. We calculate the equation of state, the gap parameter at zero temperature, and the superfluid transition temperature across a wide range of transversal confinement length scales. Particular emphasis is put on the determination of the finite-temperature phase diagram for different confinement length scales. In the end, our results are compared with recent experimental observations and we discuss them in the context of other theoretical works.