EPJ Web of Conferences 7, 01007 (2010)
https://doi.org/10.1051/epjconf/20100701007

Relativistic BCS-BEC Crossover at Quark Level

Physics Department, Tsinghua University, Beijing 100084, China

Abstract

The non-relativistic G₀G formalism of BCS-BEC crossover at finite temperature is extended to relativistic fermion systems. The theory recovers the BCS mean field approximation at zero temperature and the non-relativistic results in a proper limit. For massive fermions, when the coupling strength increases, there exist two crossovers from the weak coupling BCS superfluid to the non-relativistic BEC state and then to the relativistic BEC state. For color superconductivity at moderate baryon density, the matter is in the BCS-BEC crossover region, and the behavior of the pseudogap is quite similar to that found in high temperature superconductors.