Non-Hermitian BCS-BEC crossover of Dirac fermions
arXiv:2009.13363 · doi:10.1007/JHEP03(2021)121
Abstract
We investigate chiral symmetry breaking in a model of Dirac fermions with a complexified coupling constant whose imaginary part represents dissipation. We introduce a chiral chemical potential and observe that for real coupling a relativistic BCS-BEC crossover is realized. We solve the model in the mean-field approximation and construct the phase diagram as a function of the complex coupling. It is found that the dynamical mass increases under dissipation, although the chiral symmetry gets restored if dissipation exceeds a threshold.
arXiv comment21 pages. v2: references added. v3: section 5 added. published version
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