Vortices and antivortices in two-dimensional ultracold Fermi gases
Authors: Bighin G., Salasnich L.
Autors Affiliation: IST Austria, Campus 1, A-3400 Klosterneuburg, Austria; Univ Padua, Dipartimento Fis & Astron Galileo Galilei, Via Marzolo 8, I-35131 Padua, Italy; Univ Padua, CNISM, Via Marzolo 8, I-35131 Padua, Italy; CNR, Ist Nazl Ott, Via Nello Carrara 1, I-50019 Sesto Fiorentino, Italy
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/Review: SCIENTIFIC REPORTS
Volume: 7 Pages from: 45702-1 to: 45702-7
KeyWords: STRONG-COUPLING SUPERCONDUCTIVITY; LONG-RANGE ORDER; SUPERFLUID-HELIUM; 2 DIMENSIONS; XY-MODEL; SYSTEMS; FLUCTUATIONS; CROSSOVERDOI: 10.1038/srep45702Citations: 10data from “WEB OF SCIENCE” (of Thomson Reuters) are update at: 2023-09-24References taken from IsiWeb of Knowledge: (subscribers only)Connecting to view paper tab on IsiWeb: Click hereConnecting to view citations from IsiWeb: Click here