Regensburg 2013 – wissenschaftliches Programm
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HL: Fachverband Halbleiterphysik
HL 28: Poster Session: Graphen; Transport properties; Transport in high magnetic fields / Quantum Hall effect; Metal-semiconductor hybrid systems
HL 28.14: Poster
Montag, 11. März 2013, 16:00–20:00, Poster A
Proximity induced superconductivity in bilayer graphene — •Julien Bordaz1, Michael Wolf1,2, Fan Wu1, Hilbert von Löhneysen1,2,3,4, Detlef Beckmann1,2, Kenji Watanabe5, Takashi Taniguchi5, and Romain Danneau1,3 — 1Institute of Nanotechnology, Karlsruhe Institute of Technology, Germany — 2DFG Center for Functional Nanostructures, Karlsruhe Institute of Technology, Germany — 3Institute of Physics, Karlsruhe Institute of Technology, Germany — 4Institute for Solid-State Physics, Karlsruhe Institute of Technology, Germany — 5Advanced Materials Laboratory, National Institute for Materials Science, Tsukuba, Japan
Proximity induced superconductivity effect occurs when graphene is connected with close enough superconducting electrodes. Observations of Andreev reflection and induced supercurrents flowing through graphene sheets have already been reported in graphene. However, these effects have not been explored in bilayer graphene so far. By applying a perpendicular electric field, it is possible to open a gap in a bilayer graphene. This can be achieved in practice by designing a top gate in addition to the usual back gate. Our devices are produced on top of sapphire wafers by using transfer techniques and standard electron-beam lithography. The bilayers are sandwiched between two atomically flat hexagonal boron nitride multilayers which are both used as gate dielectric. By inducing a band gap into a bilayer graphene connected by two superconducting leads, the supercurrent could be switched off inducing a superconductor-insulator transition.