Goldstone and Higgs Hydrodynamics in the BCS-BEC Crossover

Year: 2017

Authors: Salasnich L.

Autors Affiliation: Univ Padua, Dipartimento Fis Astron Galileo Galilei, Via Marzolo 8, I-35131 Padua, Italy; Univ Padua, CNISM, Via Marzolo 8, I-35131 Padua, Italy; INO, Via Nello Carrara 1, I-50019 Sesto Fiorentino, Italy

Abstract: We discuss the derivation of a low-energy effective field theory of phase (Goldstone) and amplitude (Higgs) modes of the pairing field from a microscopic theory of attractive fermions. The coupled equations for Goldstone and Higgs fields are critically analyzed in the Bardeen-Cooper-Schrieffer (BCS)-to-Bose-Einstein condensate (BEC) crossover-both in three spatial dimensions and in two spatial dimensions. The crucial role of pair fluctuations is investigated, and the beyond-mean-field Gaussian theory of the BCS-BEC crossover is compared with available experimental data of the two-dimensional ultracold Fermi superfluid.

Journal/Review: CONDENSED MATTER

Volume: 2 (2)      Pages from: 22-1  to: 22-.12

KeyWords: superfluidity; BCS-BEC crossover
DOI: 10.3390/condmat2020022

Citations: 3
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