Tomasch Oscillations as Above-Gap Signature of Topological Superconductivity
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arXiv
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| Format: | Preprint |
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2023
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| author | Štrkalj, Antonio Chen, Xi-Rong Chen, Wei Xing, D. Y. Zilberberg, Oded |
| author_facet | Štrkalj, Antonio Chen, Xi-Rong Chen, Wei Xing, D. Y. Zilberberg, Oded |
| contents | The identification of topological superconductors usually involves searching for in-gap modes that are protected by topology. However, in the current experimental settings, the smoking-gun evidence of these in-gap modes is still lacking. In this work, we propose to distinguish between two-dimensional conventional s-wave and topological p-wave superconductors by above-gap transport signatures. Our method utilizes the emergence of Tomasch oscillations of quasiparticles in a junction consisting of a superconductor sandwiched between two metallic leads. We demonstrate that the behavior of the oscillations in conductance as a function of the interface barriers provides a distinctive signature for s-wave and p-wave superconductors. Specifically, the oscillations become weaker as the barrier strength increases in s-wave superconductors, while they become more pronounced in p-wave superconductors, which we prove to be a direct manifestation of the pairing symmetries. Our method opens a new route for identifying topological superconductors through above-gap transport. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2305_09530 |
| institution | arXiv |
| publishDate | 2023 |
| record_format | arxiv |
| spellingShingle | Tomasch Oscillations as Above-Gap Signature of Topological Superconductivity Štrkalj, Antonio Chen, Xi-Rong Chen, Wei Xing, D. Y. Zilberberg, Oded Superconductivity Mesoscale and Nanoscale Physics The identification of topological superconductors usually involves searching for in-gap modes that are protected by topology. However, in the current experimental settings, the smoking-gun evidence of these in-gap modes is still lacking. In this work, we propose to distinguish between two-dimensional conventional s-wave and topological p-wave superconductors by above-gap transport signatures. Our method utilizes the emergence of Tomasch oscillations of quasiparticles in a junction consisting of a superconductor sandwiched between two metallic leads. We demonstrate that the behavior of the oscillations in conductance as a function of the interface barriers provides a distinctive signature for s-wave and p-wave superconductors. Specifically, the oscillations become weaker as the barrier strength increases in s-wave superconductors, while they become more pronounced in p-wave superconductors, which we prove to be a direct manifestation of the pairing symmetries. Our method opens a new route for identifying topological superconductors through above-gap transport. |
| title | Tomasch Oscillations as Above-Gap Signature of Topological Superconductivity |
| topic | Superconductivity Mesoscale and Nanoscale Physics |
| url | https://arxiv.org/abs/2305.09530 |