Relativistic BCS-BEC crossover in a boson-fermion model

Journal Article · Wed Aug 01 04:00:00 EDT 2007 · Physical Review. D, Particles Fields

DOI:https://doi.org/10.1103/PHYSREVD.76.034013· OSTI ID:21027508

Jian, Deng; Qun, Wang ^[1]; Schmitt, Andreas ^[2]

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1. Department of Modern Physics, University of Science and Technology of China, Anhui 230026 (China)
2. Department of Physics, Washington University St. Louis, Missouri 63130 (United States)

We investigate the crossover from Bardeen-Cooper-Schrieffer (BCS) pairing to a Bose-Einstein condensate (BEC) in a relativistic superfluid within a boson-fermion model. The model includes, besides the fermions, separate bosonic degrees of freedom, accounting for the bosonic nature of the Cooper pairs. The crossover is realized by tuning the difference between the boson mass and boson chemical potential as a free parameter. The model yields populations of condensed and uncondensed bosons as well as gapped and ungapped fermions throughout the crossover region for arbitrary temperatures. Moreover, we observe the appearance of antiparticles for sufficiently large values of the crossover parameter. As an application, we study pairing of fermions with imbalanced populations. The model can potentially be applied to color superconductivity in dense quark matter at strong couplings.

• OSTI ID: 21027508
• Journal Information: Physical Review. D, Particles Fields, Journal Name: Physical Review. D, Particles Fields Journal Issue: 3 Vol. 76; ISSN PRVDAQ; ISSN 0556-2821
• Country of Publication: United States
• Language: English

Related Subjects

71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
ANTIPARTICLES
BCS THEORY
BOSE-EINSTEIN CONDENSATION
BOSONS
COLOR MODEL
COOPER PAIRS
DEGREES OF FREEDOM
FERMIONS
POTENTIALS
QUARK MATTER
RELATIVISTIC RANGE
SUPERCONDUCTIVITY
SUPERFLUIDITY