Light-modulated Josephson effect in Kekulé patterned graphene
W. Zeng, R. Shen
DOI 10.1103/PhysRevB.105.094510 · Physical Review B
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Abstract
We theoretically study the Josephson effect in a superconductor/normal metal/superconductor junction based on Kekulé patterned graphene. For the Kekulé-O patterned junctions, a Fermi momentum-splitting Andreev reflection at the interface can be induced by the off-resonant circularly polarized light applied in the normal region, which results in the possible π state. In contrast, for the Kekulé-Y patterned junctions, the Fermi momentum-splitting Andreev reflection is strongly suppressed due to the valley-momentum locking, and the junction always exhibits the 0 state. The dependence of the critical current on the junction length and the illumination parameter of the light field is also presented in detail.
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