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Article: Moiré trions in MoSe2/WSe2 heterobilayers

TitleMoiré trions in MoSe2/WSe2 heterobilayers
Authors
Issue Date2021
PublisherNature Publishing Group.
Citation
Nature Nanotechnology, 2021, v. 16 n. 11, p. 1208-1213 How to Cite?
AbstractTransition metal dichalcogenide moiré bilayers with spatially periodic potentials have emerged as a highly tunable platform for studying both electronic1,2,3,4,5,6 and excitonic4,7,8,9,10,11,12,13 phenomena. The power of these systems lies in the combination of strong Coulomb interactions with the capability of controlling the charge number in a moiré potential trap. Electronically, exotic charge orders at both integer and fractional fillings have been discovered2,5. However, the impact of charging effects on excitons trapped in moiré potentials is poorly understood. Here, we report the observation of moiré trions and their doping-dependent photoluminescence polarization in H-stacked MoSe2/WSe2 heterobilayers. We find that as moiré traps are filled with either electrons or holes, new sets of interlayer exciton photoluminescence peaks with narrow linewidths emerge about 7 meV below the energy of the neutral moiré excitons. Circularly polarized photoluminescence reveals switching from co-circular to cross-circular polarizations as moiré excitons go from being negatively charged and neutral to positively charged. This switching results from the competition between valley-flip and spin-flip energy relaxation pathways of photo-excited electrons during interlayer trion formation. Our results offer a starting point for engineering both bosonic and fermionic many-body effects based on moiré excitons14.
Persistent Identifierhttp://hdl.handle.net/10722/304749
ISSN
2023 Impact Factor: 38.1
2023 SCImago Journal Rankings: 14.577
ISI Accession Number ID

 

DC FieldValueLanguage
dc.contributor.authorWang, X-
dc.contributor.authorZhu, J-
dc.contributor.authorSeyler, KL-
dc.contributor.authorRivera, P-
dc.contributor.authorZheng, H-
dc.contributor.authorWang, Y-
dc.contributor.authorHe, M-
dc.contributor.authorTaniguchi, T-
dc.contributor.authorWatanabe, K-
dc.contributor.authorYan, J-
dc.contributor.authorMandrus, DG-
dc.contributor.authorGamelin, DR-
dc.contributor.authorYao, W-
dc.contributor.authorXu, X-
dc.date.accessioned2021-10-05T02:34:38Z-
dc.date.available2021-10-05T02:34:38Z-
dc.date.issued2021-
dc.identifier.citationNature Nanotechnology, 2021, v. 16 n. 11, p. 1208-1213-
dc.identifier.issn1748-3387-
dc.identifier.urihttp://hdl.handle.net/10722/304749-
dc.description.abstractTransition metal dichalcogenide moiré bilayers with spatially periodic potentials have emerged as a highly tunable platform for studying both electronic1,2,3,4,5,6 and excitonic4,7,8,9,10,11,12,13 phenomena. The power of these systems lies in the combination of strong Coulomb interactions with the capability of controlling the charge number in a moiré potential trap. Electronically, exotic charge orders at both integer and fractional fillings have been discovered2,5. However, the impact of charging effects on excitons trapped in moiré potentials is poorly understood. Here, we report the observation of moiré trions and their doping-dependent photoluminescence polarization in H-stacked MoSe2/WSe2 heterobilayers. We find that as moiré traps are filled with either electrons or holes, new sets of interlayer exciton photoluminescence peaks with narrow linewidths emerge about 7 meV below the energy of the neutral moiré excitons. Circularly polarized photoluminescence reveals switching from co-circular to cross-circular polarizations as moiré excitons go from being negatively charged and neutral to positively charged. This switching results from the competition between valley-flip and spin-flip energy relaxation pathways of photo-excited electrons during interlayer trion formation. Our results offer a starting point for engineering both bosonic and fermionic many-body effects based on moiré excitons14.-
dc.languageeng-
dc.publisherNature Publishing Group.-
dc.relation.ispartofNature Nanotechnology-
dc.titleMoiré trions in MoSe2/WSe2 heterobilayers-
dc.typeArticle-
dc.identifier.emailYao, W: wangyao@hku.hk-
dc.identifier.authorityYao, W=rp00827-
dc.description.naturelink_to_subscribed_fulltext-
dc.identifier.doi10.1038/s41565-021-00969-2-
dc.identifier.pmid34531556-
dc.identifier.scopuseid_2-s2.0-85115223948-
dc.identifier.hkuros326244-
dc.identifier.volume16-
dc.identifier.issue11-
dc.identifier.spage1208-
dc.identifier.epage1213-
dc.identifier.isiWOS:000696464000002-
dc.publisher.placeUnited Kingdom-

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