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| Main Authors: | , |
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| Format: | Preprint |
| Published: |
2023
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| Subjects: | |
| Online Access: | https://arxiv.org/abs/2306.16611 |
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| _version_ | 1866916239623847936 |
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| author | Hackner, Nico A. Brydon, P. M. R. |
| author_facet | Hackner, Nico A. Brydon, P. M. R. |
| contents | We theoretically study the low-lying collective modes of an even-parity spin-singlet superconducting bilayer, where strong spin-orbit coupling leads to a closely competing odd-parity pairing state. We develop a gauge-invariant theory for the coupling of phase fluctuations to an external electromagnetic field and show that the competing odd-parity pairing instability gives rise to a Bardasis-Schrieffer-like phase mode within the excitation gap. Accounting for the long-range Coulomb interaction, however, we find that this mode is converted into an antisymmetric plasmon and is likely pushed into the quasiparticle continuum. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2306_16611 |
| institution | arXiv |
| publishDate | 2023 |
| record_format | arxiv |
| spellingShingle | Bardasis-Schrieffer-like phase mode in a superconducting bilayer Hackner, Nico A. Brydon, P. M. R. Superconductivity We theoretically study the low-lying collective modes of an even-parity spin-singlet superconducting bilayer, where strong spin-orbit coupling leads to a closely competing odd-parity pairing state. We develop a gauge-invariant theory for the coupling of phase fluctuations to an external electromagnetic field and show that the competing odd-parity pairing instability gives rise to a Bardasis-Schrieffer-like phase mode within the excitation gap. Accounting for the long-range Coulomb interaction, however, we find that this mode is converted into an antisymmetric plasmon and is likely pushed into the quasiparticle continuum. |
| title | Bardasis-Schrieffer-like phase mode in a superconducting bilayer |
| topic | Superconductivity |
| url | https://arxiv.org/abs/2306.16611 |