▎ 摘　　要

Locally defined nanomembrane structures can be produced in graphene films on a SiC substrate with atomic steps. The contact conductance between graphene and a metal-coated nanoprobe in scanning probe microscopy can be drastically reduced by inducing local buckling of the membranes. Repeatable current switching with high reproducibility can be realized. The on/off ratio can be varied from about 10(5) to below 10 by changing the contact force. At a low contact force, the contact conductance changes from 10 mu S ("ON" state) to 100 pS ("OFF" state). This novel device structure could represent a new path to electrical switching at the nanoscale. (c) 2013 The Japan Society of Applied Physics