Tuning Locality of Pair Coherence in Graphene-based Andreev Interferometers
Tuning Locality of Pair Coherence in Graphene-based Andreev Interferometers
复制标题
石墨烯安德烈夫干涉仪中对相干性的调谐局部性
作者：
Minsoo Kim;Dongchan Jeong;Gil;Y. Shin;Hyun;Hu
We report on gate-tuned locality of superconductivity-induced phase-coherent magnetoconductance oscillations in a graphene-based Andreev interferometer, consisting of a T-shaped graphene bar in contact with a superconducting Al loop. The conductance oscillations arose from the flux change through the superconducting Al loop, with gate-dependent Fraunhofer-type modulation of the envelope. We confirm a transitional change in the character of the pair coherence, between local and nonlocal, in the same device as the effective length-to-width ratio of the device was modulated by tuning the pair-coherence length ξT in the graphene layer.
