Twisted bilayer graphene fabricated by direct bonding in a high vacuum

Abstract

Twisted bilayer graphene (TBG), in which two monolayer graphene are stacked\nwith an in-plane rotation angle, has recently become a hot topic due to unique\nelectronic structures. TBG is normally produced in air by the tear-and-stack\nmethod of mechanical exfoliation and transferring graphene flakes, by which a\nsizable, millimeter-order area, and importantly clean interface between layers\nare hard to obtain. In this study, we resolved these problems by directly\ntransferring the easy-to-exfoliate CVD-grown graphene on SiC substrate to\ngraphene in a high vacuum without using any transfer assisting medium and\nobserved electronic band modulations due to the strong interlayer coupling.\n