Fractional Josephson effect in nonuniformly strained graphene

Article

关键词: PSEUDO-MAGNETIC FIELDS;    TOPOLOGICAL PHASES;    QUANTUM;    SUPERCURRENT;   

DOI  :  10.1103/PhysRevB.95.174517

来源: SCIE

【 摘 要 】

Nonuniform strain distributions in a graphene lattice can give rise to uniform pseudomagnetic fields and associated pseudo-Landau levels without breaking time-reversal symmetry. We demonstrate that by inducing superconductivity in a nonuniformly strained graphene sheet, the lowest pseudo-Landau levels split by a pairing gap can be inverted by changing the sign of the pairing potential. As a consequence of this inversion, we predict that a Josephson pi junction deposited on top of a strained graphene sheet exhibits one-dimensional gapless modes propagating along the junction. These gapless modes mediate single electron tunneling across the junction, giving rise to the 4 pi-periodic fractional Josephson effect.

【 授权许可】

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