Publikation: Tomasch Oscillations as Above-Gap Signature of Topological Superconductivity
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National Natural Science Foundation of China: 12222406
National Natural Science Foundation of China: 12304064
Swiss National Science Foundation: 199969
Deutsche Forschungsgemeinschaft (DFG): 449653034
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The identification of topological superconductors usually involves searching for in-gap modes that are protected by topology. However, in current experimental settings, the smoking-gun evidence of these in-gap modes is still lacking. In this Letter, we propose to support the distinction between two-dimensional conventional đť‘ -wave and topological đť‘ť-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 đť‘ -wave and đť‘ť-wave superconductors. Specifically, the oscillations become weaker as the barrier strength increases in đť‘ -wave superconductors, while they become more pronounced in đť‘ť-wave superconductors, which we prove to be a direct manifestation of the pairing symmetries. Our method can serve as a complimentary probe for identifying some classes of topological superconductors through the above-gap transport.
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ŠTRKALJ, Antonio, Xi-Rong CHEN, Wei CHEN, D. Y. XING, Oded ZILBERBERG, 2024. Tomasch Oscillations as Above-Gap Signature of Topological Superconductivity. In: Physical Review Letters. American Physical Society (APS). 2024, 132(6), 066301. ISSN 0031-9007. eISSN 1079-7114. Verfügbar unter: doi: 10.1103/physrevlett.132.066301BibTex
@article{Strkalj2024-02-07Tomas-70171, year={2024}, doi={10.1103/physrevlett.132.066301}, title={Tomasch Oscillations as Above-Gap Signature of Topological Superconductivity}, number={6}, volume={132}, issn={0031-9007}, journal={Physical Review Letters}, author={Štrkalj, Antonio and Chen, Xi-Rong and Chen, Wei and Xing, D. Y. and Zilberberg, Oded}, note={Article Number: 066301} }
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