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Recent Graphene Papers from APS

Contactless Microwave Characterization of Encapsulated Graphene p−n Junctions

Physical Review: Graphene - Wed, 24/05/2017 - 10:00pm

Author(s): V. Ranjan, S. Zihlmann, P. Makk, K. Watanabe, T. Taniguchi, and C. Schönenberger

The electrical contacts needed for conventional probing of a graphene-based device can mask the very properties to be measured. The authors demonstrate a contactless measurement scheme that capacitively couples a device to a superconducting microwave resonator. Both quantum capacitance and charge-relaxation resistance can be inferred from a single measurement, and residual doping and the Fermi velocity can be quantitatively deduced. This technique offers fast, sensitive, noninvasive measurement of graphene nanocircuits, or other systems for which ohmic contacts are difficult to obtain.

[Phys. Rev. Applied 7, 054015] Published Wed May 24, 2017

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