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dc.contributor.authorHiral Patel-
dc.contributor.authorLujie Huang-
dc.contributor.authorCheol-Joo Kim-
dc.contributor.authorJiwoong Park-
dc.contributor.authorMatt W. Graham-
dc.date.available2019-06-05T07:30:03Z-
dc.date.created2019-03-15-
dc.date.issued2019-03-
dc.identifier.issn2041-1723-
dc.identifier.urihttp://oasis.postech.ac.kr/handle/2014.oak/99055-
dc.description.abstractTwisted bilayer graphene (tBLG) is a metallic material with two degenerate van Hove singularity transitions that can rehybridize to form interlayer exciton states. Here we report photoluminescence (PL) emission from tBLG after resonant 2-photon excitation, which tunes with the interlayer stacking angle, θ. We spatially image individual tBLG domains at room-temperature and show a five-fold resonant PL-enhancement over the background hot-electron emission. Prior theory predicts that interlayer orbitals mix to create 2-photon-accessible strongly-bound (~0.7 eV) exciton and continuum-edge states, which we observe as two spectral peaks in both PL excitation and excited-state absorption spectra. This peak splitting provides independent estimates of the exciton binding energy which scales from 0.5–0.7 eV with θ = 7.5° to 16.5°. A predicted vanishing exciton-continuum coupling strength helps explain both the weak resonant PL and the slower 1 ps−1 exciton relaxation rate observed. This hybrid metal-exciton behavior electron thermalization and PL emission are tunable with stacking angle for potential enhancements in optoelectronic and fast-photosensing graphene-based applications.-
dc.languageEnglish-
dc.publisherNature Publishing Group-
dc.titleStacking angle-tunable Photoluminescence from Interlayer Excitons in Twisted Bilayer Graphene-
dc.typeArticle-
dc.type.rimsART-
dc.identifier.bibliographicCitationNature Communications, v.10, pp.1445-
dc.identifier.wosid000462722200002-
dc.citation.startPage1445-
dc.citation.titleNature Communications-
dc.citation.volume10-
dc.contributor.affiliatedAuthorCheol-Joo Kim-
dc.identifier.scopusid2-s2.0-85063740283-
dc.description.journalClass1-
dc.description.isOpenAccessY-
dc.type.docTypeARTICLE-

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 KIM, CHEOL JOO
Dept. of Chemical Enginrg
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