Goldstone and Higgs Hydrodynamics in the BCS–BEC Crossover

Condensed Matter

Salasnich, Luca¹ 

关键词: superfluidity;    BCS–BEC crossover;   

DOI  :  10.3390/condmat2020022

学科分类：凝聚态物理

来源: mdpi

【 摘 要 】

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.

【 授权许可】

CC BY