Dynamically tunable moiré exciton Rydberg states in a monolayer semiconductor on twisted bilayer graphene

He, Minhao; Cai, Jiaqi; Zheng, Huiyuan; Seewald, Eric; Taniguchi, Takashi; Watanabe, Kenji; Yan, Jiaqiang; Yankowitz, Matthew; Pasupathy, Abhay; Yao, Wang; Xu, Xiaodong

doi:10.1038/s41563-023-01713-y

Dynamically tunable moiré exciton Rydberg states in a monolayer semiconductor on twisted bilayer graphene

Journal Article · Thu Jan 04 00:00:00 EST 2024 · Nature Materials

DOI:https://doi.org/10.1038/s41563-023-01713-y· OSTI ID:2378083

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Univ. of Washington, Seattle, WA (United States)
Univ. of Hong Kong (Hong Kong)
Columbia Univ., New York, NY (United States)
National Institute for Materials Science (NIMS), Tsukuba (Japan). International Center for Materials Nanoarchitectonics
National Institute for Materials Science (NIMS), Tsukuba (Japan). Research Center for Functional Materials
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States); Univ. of Tennessee, Knoxville, TN (United States)
Univ. of Hong Kong (Hong Kong); HKU-UCAS Joint Institute of Theoretical and Computational Physics at Hong Kong (Hong Kong)

Moiré excitons are emergent optical excitations in two-dimensional semiconductors with moiré superlattice potentials. Although these excitations have been observed on several platforms, a system with dynamically tunable moiré potential to tailor their properties is yet to be realized. Here we present a continuously tunable moiré potential in monolayer WSe₂, enabled by its proximity to twisted bilayer graphene (TBG) near the magic angle. By tuning local charge density via gating, TBG provides a spatially varying and dynamically tunable dielectric superlattice for modulation of monolayer WSe₂ exciton wave functions. We observed emergent moiré exciton Rydberg branches with increased energy splitting following doping of TBG due to exciton wave function hybridization between bright and dark Rydberg states. In addition, emergent Rydberg states can probe strongly correlated states in TBG at the magic angle. Finally, our study provides a new platform for engineering moiré excitons and optical accessibility to electronic states with small correlation gaps in TBG.

View Accepted Manuscript (DOE)

Research Organization:: Energy Frontier Research Centers (EFRC) (United States). Programmable Quantum Materials (Pro-QM); Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: US Army Research Office (ARO); USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: AC05-00OR22725; SC0018171; SC0019443

OSTI ID:: 2378083

Journal Information:: Nature Materials, Journal Name: Nature Materials Journal Issue: 2 Vol. 23; ISSN 1476-1122

Publisher:: Springer NatureCopyright Statement

Country of Publication:: United States

Language:: English

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