2008/12/31 by Hao Guo, Chih-Chun Chien, Yan He · 11 citations
Physics and Astronomy · #Asymmetry #Atomic and Subatomic Physics Research #Cold Atom Physics and Bose-Einstein Condensates #Condensed matter physics #Crossover #Fermi Gamma-ray Space Telescope #Fermi gas #Physics #Physics of Superconductivity and Magnetism #Quantum mechanics #Zero (linguistics) #Zero temperature #cond-mat.other #hep-ph
paper · pdf · doi:10.1016/j.nuclphysa.2009.03.003
published in Nuclear Physics A 823(1-4), 83-98 (Elsevier BV) · 18 pages, 6 figures
openalex publication_date 2009/03/15 · arxiv created 2009/04/17 · arxiv updated 2014/11/18 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
We systematically study relativistic two-species fermions with tunable attractive interactions and number-density asymmetry at zero temperature. In general, a Bardeen-Cooper-Schrieffer (BCS) - Bose-Einstein Condensation (BEC) - relativistic BEC (RBEC) crossover is observed. A generalized BCS ground state and its stability are analyzed. The homogeneous superfluid phase can become unstable and we consider phase separation in real space for neutral systems. In the nonrelativistic limit, our results are consistent with well-known results. In addition to a BCS-BEC crossover similar to that in the nonrelativistic case, in the strongly attractive regime gapless excitations of antifermions and a RBEC state are observed. We address how different phases respond to number density asymmetry and present predictive phase diagrams of BCS-BEC-RBEC crossover.