▎ 摘　　要

We have studied transport characteristics through a lateral p-n-p graphene structure with relatively wide n-channel gate length. The source-to-drain length, gate width and gate length were 4, 0.5, and 0.2 mu m, respectively. Although the tunnel barrier thickness of 2000 angstrom was comparable to the estimated mean free path, the observed conductance oscillation due to Fabry-Perot resonance clearly indicated Klein tunneling. (C) 2011 The Japan Society of Applied Physics