Non-Hermitian BCS-BEC crossover of Dirac fermions

A bstract 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 mod...

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Bibliographic Details
Published inThe journal of high energy physics Vol. 2021; no. 3; pp. 1 - 21
Main Author Kanazawa, Takuya
Format Journal Article
LanguageEnglish
Published Berlin/Heidelberg Springer Berlin Heidelberg 01.03.2021
Springer Nature B.V
SpringerOpen
Subjects
Approximation
Broken symmetry
Chemical potential
Classical and Quantum Gravitation
Coupling
Crossovers
Elementary Particles
Fermions
High energy physics
Phase Diagram of QCD
Phase diagrams
Phase transitions
Physics
Physics and Astronomy
Quantum Field Theories
Quantum Field Theory
Quantum Physics
Quarks
R&D
Regular Article - Theoretical Physics
Relativity Theory
Research & development
Spontaneous Symmetry Breaking
String Theory
Superfluidity
Symmetry
Thermal Field Theory
Spontaneous Symmetry Breaking
Phase Diagram of QCD
Thermal Field Theory
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Summary:A bstract 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.
ISSN:1029-8479
1029-8479
DOI:10.1007/JHEP03(2021)121