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Normal mass density of a superfluid Fermi gas at unitarity
KTH, Centres, Nordic Institute for Theoretical Physics NORDITA.
2013 (English)In: Physical Review A. Atomic, Molecular, and Optical Physics, ISSN 1050-2947, E-ISSN 1094-1622, Vol. 88, no 4, 043631- p.Article in journal (Refereed) Published
Abstract [en]

We calculate the normal mass density of a paired Fermi gas at unitarity. The dominant contribution near the superfluid transition is from fermionic quasiparticle excitations and is, thus, sensitive to the pairing gap. A comparison with the recent experiment of Sidorenkov et al. [Nature (London) 498, 78 (2013)] suggests that the superfluid gap near the transition temperature is larger than the BCS value, but the data do not permit a quantitative inference of the gap. Calculations of the quenched moment of inertia of a BCS superfluid in a harmonic trap are in reasonable agreement with the earlier experiment of Riedl et al. [New J. Phys. 13, 035003 (2011)].

Place, publisher, year, edition, pages
2013. Vol. 88, no 4, 043631- p.
Keyword [en]
Dominant contributions, Harmonic trap, Mass densities, Moment of inertia, Quasiparticle excitations, Superfluid Fermi gas, Superfluid gap, Superfluid transitions
National Category
Physical Sciences
Identifiers
URN: urn:nbn:se:kth:diva-134739DOI: 10.1103/PhysRevA.88.043631ISI: 000326078100015Scopus ID: 2-s2.0-84886260662OAI: oai:DiVA.org:kth-134739DiVA: diva2:668184
Note

QC 20131129

Available from: 2013-11-29 Created: 2013-11-28 Last updated: 2017-12-06Bibliographically approved

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