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Article: Every-other-layer dipolar excitons in a spin-valley locked superlattice

TitleEvery-other-layer dipolar excitons in a spin-valley locked superlattice
Authors
Issue Date23-Mar-2023
PublisherNature Research
Citation
Nature Nanotechnology, 2023, v. 18, p. 501-506 How to Cite?
AbstractMonolayer semiconducting transition metal dichalcogenides possess broken inversion symmetry and strong spin-orbit coupling, leading to a unique spin-valley locking effect. In 2H stacked pristine multilayers, spin-valley locking yields an electronic superlattice structure, where alternating layers correspond to barriers and quantum wells depending on the spin-valley indices. Here we show that the spin-valley locked superlattice hosts a kind of dipolar exciton with the electron and hole constituents separated in an every-other-layer configuration: that is, either in two even or two odd layers. Such excitons become optically bright via hybridization with intralayer excitons. This effect is also manifested by the presence of multiple anti-crossing patterns in the reflectance spectra, as the dipolar exciton is tuned through the intralayer resonance by an electric field. The reflectance spectra further reveal an excited state orbital of the every-other-layer exciton, pointing to a sizable binding energy in the same order of magnitude as the intralayer exciton. As layer thickness increases, the dipolar exciton can form a one-dimensional Bose-Hubbard chain displaying layer number-dependent fine spectroscopy structures.In multilayer WSe2, dipolar excitons with Coulomb-bound electron and hole pairs located in every other layer show unique valleytronic superlattice structure and electrical tunability.
Persistent Identifierhttp://hdl.handle.net/10722/328459
ISSN
2023 Impact Factor: 38.1
2023 SCImago Journal Rankings: 14.577
ISI Accession Number ID

 

DC FieldValueLanguage
dc.contributor.authorZhang, YN-
dc.contributor.authorXiao, CX-
dc.contributor.authorOvchinnikov, D-
dc.contributor.authorZhu, JY-
dc.contributor.authorWang, X-
dc.contributor.authorTaniguchi, T-
dc.contributor.authorWatanabe, K-
dc.contributor.authorYan, JQ-
dc.contributor.authorYao, W-
dc.contributor.authorXu, XD-
dc.date.accessioned2023-06-28T04:45:09Z-
dc.date.available2023-06-28T04:45:09Z-
dc.date.issued2023-03-23-
dc.identifier.citationNature Nanotechnology, 2023, v. 18, p. 501-506-
dc.identifier.issn1748-3387-
dc.identifier.urihttp://hdl.handle.net/10722/328459-
dc.description.abstractMonolayer semiconducting transition metal dichalcogenides possess broken inversion symmetry and strong spin-orbit coupling, leading to a unique spin-valley locking effect. In 2H stacked pristine multilayers, spin-valley locking yields an electronic superlattice structure, where alternating layers correspond to barriers and quantum wells depending on the spin-valley indices. Here we show that the spin-valley locked superlattice hosts a kind of dipolar exciton with the electron and hole constituents separated in an every-other-layer configuration: that is, either in two even or two odd layers. Such excitons become optically bright via hybridization with intralayer excitons. This effect is also manifested by the presence of multiple anti-crossing patterns in the reflectance spectra, as the dipolar exciton is tuned through the intralayer resonance by an electric field. The reflectance spectra further reveal an excited state orbital of the every-other-layer exciton, pointing to a sizable binding energy in the same order of magnitude as the intralayer exciton. As layer thickness increases, the dipolar exciton can form a one-dimensional Bose-Hubbard chain displaying layer number-dependent fine spectroscopy structures.In multilayer WSe2, dipolar excitons with Coulomb-bound electron and hole pairs located in every other layer show unique valleytronic superlattice structure and electrical tunability.-
dc.languageeng-
dc.publisherNature Research-
dc.relation.ispartofNature Nanotechnology-
dc.titleEvery-other-layer dipolar excitons in a spin-valley locked superlattice-
dc.typeArticle-
dc.identifier.doi10.1038/s41565-023-01350-1-
dc.identifier.pmid36959300-
dc.identifier.volume18-
dc.identifier.spage501-
dc.identifier.epage506-
dc.identifier.eissn1748-3395-
dc.identifier.isiWOS:000958014300002-
dc.publisher.placeBERLIN-
dc.identifier.issnl1748-3387-

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