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