2000 character limit reached
Breakdown of the Meissner effect at the zero exceptional point in non-Hermitian two-band BCS model (2211.11422v3)
Published 21 Nov 2022 in cond-mat.quant-gas, cond-mat.supr-con, and quant-ph
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.
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