Breakdown of the Meissner effect at the zero exceptional point in non-Hermitian two-band BCS model
Quantum Gases
2024-03-20 v3 Superconductivity
Quantum Physics
Abstract
The spontaneous symmetry breaking of a continuous symmetry in complex field theory at the exceptional point of the parameter space is known to exhibit interesting phenomena, such as the breakdown of a Higgs mechanism. In this work, we derive the complex Ginzburg-Landau model from a non-Hermitian two-band BCS model via path integral and investigate its spontaneous symmetry breaking. We find that analog to the Higgs mechanism, the Meissner effect of the complex Ginzburg-Landau model also breaks down at the exceptional point while the gap parameters stay finite.
Keywords
Cite
@article{arxiv.2211.11422,
title = {Breakdown of the Meissner effect at the zero exceptional point in non-Hermitian two-band BCS model},
author = {Takano Taira},
journal= {arXiv preprint arXiv:2211.11422},
year = {2024}
}