Berlin 2015 – scientific programme
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HL: Fachverband Halbleiterphysik
HL 29: Transport: Graphene (TT with CPP/DS/DY/HL/O)
HL 29.1: Talk
Tuesday, March 17, 2015, 09:30–09:45, A 053
Observation of supercurrent in graphene-based Josephson junction — •Libin Wang1, Chuan Xu2, Sen Li1, Wencai Ren2, and Ning Kang1 — 1Key Laboratory for the Physics and Chemistry of Nanodevices and Department of Electronics, Peking University, Beijing 100871, China — 2Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China
Josephon junctions with a normal metal region sandwiched between two superconductors (S) are known as superconductor- normal-superconductor (SNS) structures. It has attracted significant attention especially when changing the normal metal with graphene, which allow for high tunability with the gate voltage and to study the proximity effect of the massless Dirac fermions. Here we report our work on graphene-based Josephon junction with a new two dimensional superconductor crystal, which grown directly on graphene, as superconducting electrodes. At low temperature, we observer proximity effect induced supercurrent flowing through the junction. The temperature and the magnetic field dependences of the critical current characteristics of the junction are also studied. The critical current exhibits a Fraunhofer-type diffraction pattern against magnetic field. Our experiments provided a new route of fabrication of graphene-based Josephon junction.