Tunable anomalous Andreev reflection and triplet pairings in spin-orbit-coupled graphene
Razieh Beiranvand, Hossein Hamzehpour, Mohammad Alidoust
DOI 10.1103/PhysRevB.94.125415 · Physical Review B
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Abstract
We theoretically study scattering process and superconducting triplet correlations in a graphene junction comprised of ferromagnet-RSO-superconductor in which RSO stands for a region with Rashba spin-orbit interaction. Our results reveal spin-polarized subgap transport through the system due to an anomalous equal-spin Andreev reflection in addition to conventional backscatterings. We calculate equal- and opposite-spin pair correlations near the F-RSO interface and demonstrate direct link of the anomalous Andreev reflection and equal-spin pairings arisen due to the proximity effect in the presence of RSO interaction. Moreover, we show that the amplitude of anomalous Andreev reflection, and thus the triplet pairings, are experimentally controllable when incorporating the influences of both tunable strain and Fermi level in the nonsuperconducting region. Our findings can be confirmed by a conductance spectroscopy experiment and may provide more insights into the proximity-induced RSO coupling in graphene layers reported recently in experiments [A. Avsar et al., Nat. Commun. 5, 4875 (2014); Z. Wang et al., Phys. Rev. Lett. 114, 016603 (2015); J. B. S. Mendes et al., Phys. Rev. Lett. 115, 226601 (2015); S. Dushenko et al., Phys. Rev. Lett. 116, 166102 (2016)].
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