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

TitleDynamically tunable moiré exciton Rydberg states in a monolayer semiconductor on twisted bilayer graphene
Authors
Issue Date4-Jan-2024
PublisherNature Research
Citation
Nature Materials, 2024, v. 23, n. 2, p. 224-229 How to Cite?
Abstract

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. Our study provides a new platform for engineering moiré excitons and optical accessibility to electronic states with small correlation gaps in TBG.


Persistent Identifierhttp://hdl.handle.net/10722/340016
ISSN
2023 Impact Factor: 37.2
2023 SCImago Journal Rankings: 14.231
ISI Accession Number ID

 

DC FieldValueLanguage
dc.contributor.authorHe, MH-
dc.contributor.authorCai, JQ-
dc.contributor.authorZheng, HY-
dc.contributor.authorSeewald, E-
dc.contributor.authorTaniguchi, T-
dc.contributor.authorWatanabe, K-
dc.contributor.authorYan, JQ-
dc.contributor.authorYankowitz, M-
dc.contributor.authorPasupathy, A-
dc.contributor.authorYao, W-
dc.contributor.authorXu, XD-
dc.date.accessioned2024-03-11T10:41:02Z-
dc.date.available2024-03-11T10:41:02Z-
dc.date.issued2024-01-04-
dc.identifier.citationNature Materials, 2024, v. 23, n. 2, p. 224-229-
dc.identifier.issn1476-1122-
dc.identifier.urihttp://hdl.handle.net/10722/340016-
dc.description.abstract<p>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 WSe<sub>2</sub>, 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 WSe<sub>2</sub> 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. Our study provides a new platform for engineering moiré excitons and optical accessibility to electronic states with small correlation gaps in TBG.</p>-
dc.languageeng-
dc.publisherNature Research-
dc.relation.ispartofNature Materials-
dc.titleDynamically tunable moiré exciton Rydberg states in a monolayer semiconductor on twisted bilayer graphene-
dc.typeArticle-
dc.identifier.doi10.1038/s41563-023-01713-y-
dc.identifier.pmid38177379-
dc.identifier.scopuseid_2-s2.0-85181524400-
dc.identifier.volume23-
dc.identifier.issue2-
dc.identifier.spage224-
dc.identifier.epage229-
dc.identifier.eissn1476-4660-
dc.identifier.isiWOS:001136711800004-
dc.publisher.placeBERLIN-
dc.identifier.issnl1476-1122-

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