• DOI:10.1103/PhysRevD.86.105010
• Corpus ID: 118755519

Superconducting phase transitions induced by chemical potential in (2+1)-dimensional four-fermion quantum field theory

@article{Klimenko2012SuperconductingPT,
  title={Superconducting phase transitions induced by chemical potential in (2+1)-dimensional four-fermion quantum field theory},
  author={Konstantin Klimenko and Roman Zhokhov and Vladimir Ch. Zhukovsky},
  journal={Physical Review D},
  year={2012},
  volume={86},
  pages={105010}
}

• K. Klimenko, R. Zhokhov, V. Zhukovsky
• Published 30 October 2012
• Physics
• Physical Review D

In the paper a generalization of the (1+1)-dimensional model by Chodos et al [Phys. Rev. D61, 045011 (2000)] has been performed to the case of (2+1)-dimensional spacetime. The model includes four-fermion interaction both in the fermion-antifermion (or chiral) and fermion-fermion (or superconducting) channels. We study temperature $T$ and chemical potential $\mu$ induced phase transitions in the leading order of large-$N$ expansion technique, where $N$ is a number of fermion fields. It is shown that at sufficiently large values of $\mu$ and arbitrary relations between coupling constants, superconducting phase appears in the system both at T=0 and $T>0$. In particular, at T=0 and sufficiently weak attractive interaction in the chiral channel, the Cooper pairing occurs for arbitrary couplings in the superconducting channel even at infinitesimal values of $\mu$.