Breakdown of the Meissner effect at the zero exceptional point in non-Hermitian two-band BCS model
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arXiv
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| Format: | Preprint |
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2022
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| _version_ | 1866909140470726656 |
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| author | Taira, Takano |
| author_facet | Taira, Takano |
| contents | 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. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2211_11422 |
| institution | arXiv |
| publishDate | 2022 |
| record_format | arxiv |
| spellingShingle | Breakdown of the Meissner effect at the zero exceptional point in non-Hermitian two-band BCS model Taira, Takano Quantum Gases Superconductivity Quantum Physics 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. |
| title | Breakdown of the Meissner effect at the zero exceptional point in non-Hermitian two-band BCS model |
| topic | Quantum Gases Superconductivity Quantum Physics |
| url | https://arxiv.org/abs/2211.11422 |