Breakdown of the Meissner effect at the zero exceptional point in non-Hermitian two-band BCS model

• URL: http://arxiv.org/abs/2211.11422v3
• Date: Tue, 19 Mar 2024 00:51:56 GMT
• Title: Breakdown of the Meissner effect at the zero exceptional point in non-Hermitian two-band BCS model
• Authors: Takano Taira,
• Abstract summary: We derive the complex Ginzburg-Landau model from a non-Hermitian two-band BCS model via path integral. 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.
• Score: 0.0
• License: http://creativecommons.org/licenses/by/4.0/
• 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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