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Specular Andreev reflection and Andreev interference in an Ising superconductor junction

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2025

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Li, Gaoyang
Xing, Yanxia
Tang, Gaomin

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https://doi.org/10.1103/ydwg-y4f8
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National Natural Science Foundation of China: 12088101
National Natural Science Foundation of China: 12374048
National Natural Science Foundation of China: 12174023
Deutsche Forschungsgemeinschaft (DFG): 443404566
Deutsche Forschungsgemeinschaft (DFG): SPP 2244
Deutsche Forschungsgemeinschaft (DFG): 467596333

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Physical Review B. American Physical Society (APS). 2025, 112(8), L081407. ISSN 2469-9950. eISSN 2469-9969. Verfügbar unter: doi: 10.1103/ydwg-y4f8

Zusammenfassung

Being resilient to magnetic field, the Ising superconductor serves as an exceptional platform for studying the interplay between superconductivity and magnetism. In this Letter, we first explore the transport properties of a two-terminal graphene–Ising superconductor junction where mirage gaps are induced in the superconductor by an exchange field due to the magnetic proximity effect. We demonstrate that the chemical potential range of graphene supporting specular Andreev reflection at the interface is between the two mirage gaps and about twice the Ising spin-orbit coupling strength. This enhances the resilience of observing specular Andreev reflection against graphene potential fluctuations in experiments. We further study the Andreev interference effect based on a four-terminal junction of which two terminals consist of Ising superconductors in the presence of exchange fields. Due to the finite contribution from the spin-triplet pairing, the interference can be modulated by tuning the relative orientation of the exchange fields in addition to the traditional scheme by changing the superconducting phase difference and the chemical potential of the normal region.

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ISO 690LI, Gaoyang, Sourabh Prakash PATIL, Yanxia XING, Wolfgang BELZIG, Gaomin TANG, 2025. Specular Andreev reflection and Andreev interference in an Ising superconductor junction. In: Physical Review B. American Physical Society (APS). 2025, 112(8), L081407. ISSN 2469-9950. eISSN 2469-9969. Verfügbar unter: doi: 10.1103/ydwg-y4f8
BibTex
@article{Li2025-08-15Specu-74411,
  title={Specular Andreev reflection and Andreev interference in an Ising superconductor junction},
  year={2025},
  doi={10.1103/ydwg-y4f8},
  number={8},
  volume={112},
  issn={2469-9950},
  journal={Physical Review B},
  author={Li, Gaoyang and Patil, Sourabh Prakash and Xing, Yanxia and Belzig, Wolfgang and Tang, Gaomin},
  note={Article Number: L081407}
}
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