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Spin-polarized equal-spin Andreev reflection in antiferromagnetic graphene

Author

Listed:
  • Weiwei Yan

    (Nanjing University)

  • W. Zeng

    (Jiangsu University
    Jiangsu Engineering Research Center on Quantum Perception and Intelligent, Detection of Agricultural Information)

  • Yupeng Huang

    (Nanjing University)

  • R. Shen

    (Nanjing University
    Nanjing University)

Abstract

The transport properties of the graphene-based antiferromagnet/insulator/ferromagnet/superconductor junction with noncollinear magnetic moments are theoretically investigated under the Bogoliubov-de Gennes equation. By introducing a mass term into the antiferromagnetic region, the spin-polarized equal-spin Andreev reflection (EAR) can be achieved for all voltages in the subgap region, free from any interference from the opposite-spin Andreev reflection (OAR). The transition from the retro EAR to the specular EAR can be realized by adjusting the Fermi level within the antiferromagnetic region. The perfect EAR can be obtained, suggesting an efficient equal-spin pairing correlation. Furthermore, we note that the EAR exhibits magnetoisotropy with an in-plane ferromagnetic exchange field, which is opposite to the results in a ferromagnet/ferromagnet/superconductor junction. Graphical abstract

Suggested Citation

  • Weiwei Yan & W. Zeng & Yupeng Huang & R. Shen, 2024. "Spin-polarized equal-spin Andreev reflection in antiferromagnetic graphene," The European Physical Journal B: Condensed Matter and Complex Systems, Springer;EDP Sciences, vol. 97(1), pages 1-7, January.
    • Handle: RePEc:spr:eurphb:v:97:y:2024:i:1:d:10.1140_epjb_s10051-023-00647-3
    DOI: 10.1140/epjb/s10051-023-00647-3
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