Supercurrent rectification effect in graphene-based Josephson junctions
Ya-Jun Wei, Han-Lin Liu, J. Wang, Jun-Feng Liu
DOI 10.1103/PhysRevB.106.165419 · Physical Review B
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Abstract
We report a theoretic study of the supercurrent rectification effect in the graphene-based superconductor (GS) junction without invoking any spin-related interaction. By introducing the valley coupling effect through the Kekulé lattice distortion as well as the valley polarization interaction, we demonstrate that the GS/G/GS Josephson junction (JJ) can exhibit not only a π-state JJ but also a ϕ0-state one, in which a nonzero supercurrent can flow without the superconducting phase difference between the two GS electrodes. A supercurrent rectification effect, that the critical supercurrent is asymmetric between the two opposite flowing directions, is identified. The conditions for the optimal supercurrent rectification effect are also discussed.
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