https://doi.org/10.1140/epjb/s10051-023-00647-3
Regular Article - Solid State and Materials
Spin-polarized equal-spin Andreev reflection in antiferromagnetic graphene
1
National Laboratory of Solid State Microstructures and School of Physics, Nanjing University, 210093, Nanjing, China
2
Collaborative Innovation Center of Advanced Microstructures, Nanjing University, 210093, Nanjing, China
3
School of Physics and Electronic Engineering, Jiangsu University, 212013, Zhenjiang, China
4
Jiangsu Engineering Research Center on Quantum Perception and Intelligent, Detection of Agricultural Information, 212013, Zhenjiang, China
Received:
3
November
2023
Accepted:
21
December
2023
Published online:
10
January
2024
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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© The Author(s), under exclusive licence to EDP Sciences, SIF and Springer-Verlag GmbH Germany, part of Springer Nature 2024. Springer Nature or its licensor (e.g. a society or other partner) holds exclusive rights to this article under a publishing agreement with the author(s) or other rightsholder(s); author self-archiving of the accepted manuscript version of this article is solely governed by the terms of such publishing agreement and applicable law.
