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Pure equal-spin and opposite-spin crossed Andreev reflection in spin-orbit-coupled graphene

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Abstract

We theoretically investigate the nonlocal transport in the ferromagnet/s-wave superconductor/Rashba spin-orbit coupled region/ferromagnet hybrid junction composed of the gapped graphene lattices. The equal-spin crossed Andreev reflection (ECAR) and the opposite-spin crossed Andreev reflection (OCAR) can be generated separately. The ECAR dominant transport and the OCAR dominant one appear for the junction with antiparallel and parallel magnetization of two ferromagnetic leads, respectively. The pure ECAR (OCAR) is achieved not only at the Dirac point but over a large voltage range, suggesting the highly efficient nonlocal splitting of the Cooper pairs with spin-triplet (spin-singlet) pairing correlations.

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This manuscript has no associated data or the data will not be deposited. [Authors’ comment: There are no associated data available.].

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Acknowledgements

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

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Authors and Affiliations

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

    Weiwei Yan, W. Zeng & R. Shen

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

    R. Shen

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  1. Weiwei Yan
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WY: derivation of equations, numerical calculations, writing, and reviewing. WZ: writing, and reviewing. RS: writing, and reviewing.

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Correspondence to R. Shen.

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Yan, W., Zeng, W. & Shen, R. Pure equal-spin and opposite-spin crossed Andreev reflection in spin-orbit-coupled graphene. Eur. Phys. J. B 96, 83 (2023). https://doi.org/10.1140/epjb/s10051-023-00555-6

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