Origin of Subharmonic Gap Structure of DC Current-Biased Josephson Junctions
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arXiv
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| Hauptverfasser: | , , |
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| Format: | Preprint |
| Veröffentlicht: |
2024
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| _version_ | 1866910932176732160 |
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| author | Lahiri, Aritra Choi, Sang-Jun Trauzettel, Björn |
| author_facet | Lahiri, Aritra Choi, Sang-Jun Trauzettel, Björn |
| contents | The current-voltage characteristics of Josephson junctions exhibit a subharmonic gap structure (SGS), denoting jumps at specific voltages. While the prevalent multiple Andreev reflection theory matches the experimentally observed SGS, it is limited to a DC \emph{voltage} bias. For a DC \emph{current} bias, existing theories are restricted to low-transparency junctions and fail to capture the full SGS. We introduce a microscopic Floquet approach applicable for arbitrary transparencies, and recover the correct SGS for a DC \emph{current} bias. We provide a comprehensive understanding of SGS for a DC \emph{current} bias, which entails two-quasiparticle tunneling processes absent in existing theories, via two complementary perspectives: in the frequency domain, as generalised Andreev reflections absorbing multiple energies, and in the time domain, as the interference of non-equilibrium current pulses. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2412_09862 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Origin of Subharmonic Gap Structure of DC Current-Biased Josephson Junctions Lahiri, Aritra Choi, Sang-Jun Trauzettel, Björn Mesoscale and Nanoscale Physics The current-voltage characteristics of Josephson junctions exhibit a subharmonic gap structure (SGS), denoting jumps at specific voltages. While the prevalent multiple Andreev reflection theory matches the experimentally observed SGS, it is limited to a DC \emph{voltage} bias. For a DC \emph{current} bias, existing theories are restricted to low-transparency junctions and fail to capture the full SGS. We introduce a microscopic Floquet approach applicable for arbitrary transparencies, and recover the correct SGS for a DC \emph{current} bias. We provide a comprehensive understanding of SGS for a DC \emph{current} bias, which entails two-quasiparticle tunneling processes absent in existing theories, via two complementary perspectives: in the frequency domain, as generalised Andreev reflections absorbing multiple energies, and in the time domain, as the interference of non-equilibrium current pulses. |
| title | Origin of Subharmonic Gap Structure of DC Current-Biased Josephson Junctions |
| topic | Mesoscale and Nanoscale Physics |
| url | https://arxiv.org/abs/2412.09862 |