Vertex corrections to nonlinear photoinduced currents in 2D superconductors
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arXiv
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| Format: | Preprint |
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2025
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| _version_ | 1866909887247679488 |
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| author | Parafilo, A. V. Kovalev, V. M. Savenko, I. G. |
| author_facet | Parafilo, A. V. Kovalev, V. M. Savenko, I. G. |
| contents | The emergence of a rectified steady-state supercurrent as a response to the photoexcited current of the quasiparticles constitutes the concept of a superconducting photodiode. This phenomenon occurs in a two-dimensional thin superconducting film with a built-in DC supercurrent that is exposed to a circularly polarized external electromagnetic field. The flow of a Cooper-pair condensate, resulting as a second-order photo-response in a direction transverse to the initially built-in supercurrent, represents a superconducting counterpart to the photogalvanic effect. In this paper, we examine the photodiode supercurrent by restoring gauge invariance within the mean-field BCS framework. To achieve this, we derive an impurity-sensitive BCS-interaction-induced correction to the vertex function by performing self-consistent calculations within the Keldysh Green's function technique. The resulting photodiode current can be utilized for spectroscopic analysis of typical relaxation times in superconducting films. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2506_17714 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Vertex corrections to nonlinear photoinduced currents in 2D superconductors Parafilo, A. V. Kovalev, V. M. Savenko, I. G. Superconductivity Mesoscale and Nanoscale Physics Optics The emergence of a rectified steady-state supercurrent as a response to the photoexcited current of the quasiparticles constitutes the concept of a superconducting photodiode. This phenomenon occurs in a two-dimensional thin superconducting film with a built-in DC supercurrent that is exposed to a circularly polarized external electromagnetic field. The flow of a Cooper-pair condensate, resulting as a second-order photo-response in a direction transverse to the initially built-in supercurrent, represents a superconducting counterpart to the photogalvanic effect. In this paper, we examine the photodiode supercurrent by restoring gauge invariance within the mean-field BCS framework. To achieve this, we derive an impurity-sensitive BCS-interaction-induced correction to the vertex function by performing self-consistent calculations within the Keldysh Green's function technique. The resulting photodiode current can be utilized for spectroscopic analysis of typical relaxation times in superconducting films. |
| title | Vertex corrections to nonlinear photoinduced currents in 2D superconductors |
| topic | Superconductivity Mesoscale and Nanoscale Physics Optics |
| url | https://arxiv.org/abs/2506.17714 |