Vortices and antivortices in two-dimensional ultracold Fermi gases Journal Article

Author(s): Bighin, Giacomo; Salasnich, Luca
Article Title: Vortices and antivortices in two-dimensional ultracold Fermi gases
Affiliation IST Austria
Abstract: Vortices are commonly observed in the context of classical hydrodynamics: from whirlpools after stirring the coffee in a cup to a violent atmospheric phenomenon such as a tornado, all classical vortices are characterized by an arbitrary circulation value of the local velocity field. On the other hand the appearance of vortices with quantized circulation represents one of the fundamental signatures of macroscopic quantum phenomena. In two-dimensional superfluids quantized vortices play a key role in determining finite-temperature properties, as the superfluid phase and the normal state are separated by a vortex unbinding transition, the Berezinskii-Kosterlitz-Thouless transition. Very recent experiments with two-dimensional superfluid fermions motivate the present work: we present theoretical results based on the renormalization group showing that the universal jump of the superfluid density and the critical temperature crucially depend on the interaction strength, providing a strong benchmark for forthcoming investigations.
Journal Title: Scientific Reports
Volume: 7
ISSN: 20452322
Publisher: Nature Publishing Group  
Date Published: 2017-04-04
Start Page: Article number: 45702
Copyright Statement: CC BY 4.0
DOI: 10.1038/srep45702
Notes: The authors thank L. Benfatto, P. A. Marchetti, C. Sà de Melo, I. Nandori G. Strinati, F. Toigo, and A. Trombettoni for fruitful discussions.
Open access: yes (OA journal)
IST Austria Authors
  1. Giacomo Bighin
    2 Bighin
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