Strong interlayer interactions in bilayer and trilayer moiré superlattices

Xie, Saien; Faeth, Brendan D.; Tang, Yanhao; Li, Lizhong; Gerber, Eli; Parzyck, Christopher T.; Chowdhury, Debanjan; Zhang, Ya-Hui; Jozwiak, Christopher; Bostwick, Aaron; Rotenberg, Eli; Kim, Eun-Ah; Shan, Jie; Mak, Kin Fai; Shen, Kyle M.

doi:10.1126/sciadv.abk1911

Strong interlayer interactions in bilayer and trilayer moiré superlattices

Journal Article · Fri Mar 25 00:00:00 EDT 2022 · Science Advances

DOI:https://doi.org/10.1126/sciadv.abk1911· OSTI ID:1891307

^[1]; ^[1]; ^[1]; Li, Lizhong ^[1]; ^[1]; ^[1]; ^[1]; Zhang, Ya-Hui ^[2]; ^[3]; ^[3]; ^[3]; ^[1]; Shan, Jie ^[1]; ^[1]; ^[1]

Cornell Univ., Ithaca, NY (United States)
Harvard Univ., Cambridge, MA (United States)
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Advanced Light Source (ALS)

Moiré superlattices constructed from transition metal dichalcogenides have demonstrated a series of emergent phenomena, including moiré excitons, flat bands, and correlated insulating states. All of these phenomena depend crucially on the presence of strong moiré potentials, yet the properties of these moiré potentials, and the mechanisms by which they can be generated, remain largely open questions. Here, we use angle-resolved photoemission spectroscopy with submicron spatial resolution to investigate an aligned WS₂/WSe₂ moiré superlattice and graphene/WS₂/WSe₂ trilayer heterostructure. Our experiments reveal that the hybridization between moiré bands in WS₂/WSe₂ exhibits an unusually large momentum dependence, with the splitting between moiré bands at the Γ point more than an order of magnitude larger than that at K point. In addition, we discover that the same WS₂/WSe₂ superlattice can imprint an unexpectedly large moiré potential on a third, separate layer of graphene (g/WS₂/WSe₂), suggesting new avenues for engineering two-dimensional moiré superlattices.

View Accepted Manuscript (DOE)

Research Organization:: Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)

Sponsoring Organization:: National Science Foundation (NSF); US Air Force Office of Scientific Research (AFOSR); USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: AC02-05CH11231

OSTI ID:: 1891307

Journal Information:: Science Advances, Journal Name: Science Advances Journal Issue: 12 Vol. 8; ISSN 2375-2548

Publisher:: AAASCopyright Statement

Country of Publication:: United States

Language:: English

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