グラファイト超薄膜の超伝導近接効果 [in Japanese] Superconducting Proximity Effect in Multilayer Graphene [in Japanese]
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Since the experimental discovery of graphene (single layer of graphite) in 2004, the research of single and multi-layer graphene has attracted much attention both theoretically and experimentally. In this article, from the experimental point of view, we describe the simple and special preparation of single and multi-layer graphene devices and report our recent stydy on superconducting proximity effect in multilayer graphene. As the gate voltage is swept, the proximity-induced superconductivity in multilayer graphene shows the bipolar behavior, from the hole supercurrent to the electron supercurrent. The following unusual facts are found: (1) for an arbitrary normal state resistance, the electron critical supercurrent is larger than the hole critical supercurrent, indicating the breakdown of the electron-hole symmetry. (2) The temperature dependence of the critical supercurrent cannot be explained by the standard theory for the superconducting proximity effect.
- J. Surf. Sci. Soc. Jpn.
J. Surf. Sci. Soc. Jpn. 29(5), 315-320, 2008-05-10
The Surface Science Society of Japan