Goldstone and Higgs Hydrodynamics in the BCS-BEC Crossover
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 crossoverDOI: 10.3390/condmat2020022Citations: 3data from “WEB OF SCIENCE” (of Thomson Reuters) are update at: 2021-10-24References taken from IsiWeb of Knowledge: (subscribers only)Connecting to view paper tab on IsiWeb: Click hereConnecting to view citations from IsiWeb: Click here