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Spin-polarized equal-spin Andreev reflection in antiferromagnetic graphene

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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.

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This manuscript has no associated data or the data will not be deposited. [Authors’ comment: All relevant data for this study are presented in the main text of the manuscript. Therefore, there is no data or the data will not be deposited.]

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Acknowledgements

This work is supported by the National Key R &D Program of China (Grant No. 2022YFA1403601).

Author information

Authors and Affiliations

  1. National Laboratory of Solid State Microstructures and School of Physics, Nanjing University, Nanjing, 210093, China

    Weiwei Yan, Yupeng Huang & R. Shen

  2. Collaborative Innovation Center of Advanced Microstructures, Nanjing University, Nanjing, 210093, China

    R. Shen

  3. School of Physics and Electronic Engineering, Jiangsu University, Zhenjiang, 212013, China

    W. Zeng

  4. Jiangsu Engineering Research Center on Quantum Perception and Intelligent, Detection of Agricultural Information, Zhenjiang, 212013, China

    W. Zeng

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  1. Weiwei Yan
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  2. W. Zeng
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Contributions

WY: derivation of equations, numerical calculations, writing, and reviewing. WZ: reviewing. YH: reviewing. RS: writing, and reviewing.

Corresponding author

Correspondence to R. Shen.

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Yan, W., Zeng, W., Huang, Y. et al. Spin-polarized equal-spin Andreev reflection in antiferromagnetic graphene. Eur. Phys. J. B 97, 4 (2024). https://doi.org/10.1140/epjb/s10051-023-00647-3

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