DC Field | Value | Language |
---|---|---|
dc.contributor.author | Hiral Patel | - |
dc.contributor.author | Lujie Huang | - |
dc.contributor.author | Cheol-Joo Kim | - |
dc.contributor.author | Jiwoong Park | - |
dc.contributor.author | Matt W. Graham | - |
dc.date.accessioned | 2019-06-05T07:30:03Z | - |
dc.date.available | 2019-06-05T07:30:03Z | - |
dc.date.created | 2019-03-15 | - |
dc.date.issued | 2019-03 | - |
dc.identifier.issn | 2041-1723 | - |
dc.identifier.uri | https://oasis.postech.ac.kr/handle/2014.oak/99055 | - |
dc.description.abstract | Twisted 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.language | English | - |
dc.publisher | Nature Publishing Group | - |
dc.relation.isPartOf | Nature Communications | - |
dc.title | Stacking angle-tunable Photoluminescence from Interlayer Excitons in Twisted Bilayer Graphene | - |
dc.type | Article | - |
dc.identifier.doi | 10.1038/s41467-019-09097-x | - |
dc.type.rims | ART | - |
dc.identifier.bibliographicCitation | Nature Communications, v.10, pp.1445 | - |
dc.identifier.wosid | 000462722200002 | - |
dc.citation.startPage | 1445 | - |
dc.citation.title | Nature Communications | - |
dc.citation.volume | 10 | - |
dc.contributor.affiliatedAuthor | Cheol-Joo Kim | - |
dc.identifier.scopusid | 2-s2.0-85063740283 | - |
dc.description.journalClass | 1 | - |
dc.description.journalClass | 1 | - |
dc.description.isOpenAccess | Y | - |
dc.type.docType | ARTICLE | - |
dc.subject.keywordPlus | BINDING-ENERGY | - |
dc.relation.journalWebOfScienceCategory | Multidisciplinary Sciences | - |
dc.description.journalRegisteredClass | scie | - |
dc.description.journalRegisteredClass | scopus | - |
dc.relation.journalResearchArea | Science & Technology - Other Topics | - |
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