2020/10/15 by Saien Xie, Brendan D. Faeth, Xie, Saien +27
Materials Science · Physics and Astronomy · #2D Materials and Applications #Ga2O3 and related materials #Graphene research and applications #cond-mat.mtrl-sci
paper · pdf · doi:10.48550/arxiv.2010.07806
arxiv created 2020/10/15 · arxiv updated 2020/10/16
Moiré superlattices comprised of stacked two-dimensional materials present a versatile platform for engineering and investigating new emergent quantum states of matter. At present, the vast majority of investigated systems have long moiré wavelengths, but investigating these effects at shorter, incommensurate wavelengths, and at higher energy scales, remains a challenge. Here, we employ angle-resolved photoemission spectroscopy (ARPES) with sub-micron spatial resolution to investigate a series of different moiré superlattices which span a wide range of wavelengths, from a short moiré wavelength of 0.5 nm for a graphene/WSe2 (g/WSe2) heterostructure, to a much longer wavelength of 8 nm for a WS2/WSe2 heterostructure. We observe the formation of minibands with distinct dispersions formed by the moiré potential in both systems. Finally, we discover that the WS2/WSe2 heterostructure can imprint a surprisingly large moiré potential on a third, separate layer of graphene (g/WS2/WSe2), suggesting a new avenue for engineering moiré superlattices in two-dimensional materials.