“Tunneling transport in a few monolayer-thick WS2/graphene heterojunction”
Takehiro Yamaguchi, Rai Moriya, Yoshihisa Inoue, Sei Morikawa, Satoru Masubuchi, Kenji Watanabe, Takashi Taniguchi, and Tomoki Machida
Applied Physics Letters 105, 223109 (2014)