Show simple item record

dc.contributor.authorLin, Kai-Qiang
dc.contributor.authorOng, Chin Shen
dc.contributor.authorBange, Sebastian
dc.contributor.authorFaria Junior, Paulo E
dc.contributor.authorPeng, Bo
dc.contributor.authorZiegler, Jonas D
dc.contributor.authorZipfel, Jonas
dc.contributor.authorBäuml, Christian
dc.contributor.authorParadiso, Nicola
dc.contributor.authorWatanabe, Kenji
dc.contributor.authorTaniguchi, Takashi
dc.contributor.authorStrunk, Christoph
dc.contributor.authorMonserrat, Bartomeu
dc.contributor.authorFabian, Jaroslav
dc.contributor.authorChernikov, Alexey
dc.contributor.authorQiu, Diana Y
dc.contributor.authorLouie, Steven G
dc.contributor.authorLupton, John M
dc.date.accessioned2021-10-20T00:47:53Z
dc.date.available2021-10-20T00:47:53Z
dc.date.issued2021-09-17
dc.identifier.issn2041-1723
dc.identifier.otherPMC8448890
dc.identifier.other34535654
dc.identifier.urihttps://www.repository.cam.ac.uk/handle/1810/329656
dc.description.abstractMonolayer transition-metal dichalcogenides (TMDCs) show a wealth of exciton physics. Here, we report the existence of a new excitonic species, the high-lying exciton (HX), in single-layer WSe<sub>2</sub> with an energy of ~3.4 eV, almost twice the band-edge A-exciton energy, with a linewidth as narrow as 5.8 meV. The HX is populated through momentum-selective optical excitation in the K-valleys and is identified in upconverted photoluminescence (UPL) in the UV spectral region. Strong electron-phonon coupling results in a cascaded phonon progression with equidistant peaks in the luminescence spectrum, resolvable to ninth order. Ab initio GW-BSE calculations with full electron-hole correlations explain HX formation and unmask the admixture of upper conduction-band states to this complex many-body excitation. These calculations suggest that the HX is comprised of electrons of negative mass. The coincidence of such high-lying excitonic species at around twice the energy of band-edge excitons rationalizes the excitonic quantum-interference phenomenon recently discovered in optical second-harmonic generation (SHG) and explains the efficient Auger-like annihilation of band-edge excitons.
dc.languageeng
dc.rightsAttribution 4.0 International
dc.rights.urihttps://creativecommons.org/licenses/by/4.0/
dc.sourceessn: 2041-1723
dc.sourcenlmid: 101528555
dc.titleNarrow-band high-lying excitons with negative-mass electrons in monolayer WSe<sub>2</sub>.
dc.typeArticle
dc.date.updated2021-10-20T00:47:51Z
prism.issueIdentifier1
prism.publicationNameNature communications
prism.volume12
dc.identifier.doi10.17863/CAM.77105
rioxxterms.versionofrecord10.1038/s41467-021-25499-2
rioxxterms.versionVoR
rioxxterms.licenseref.urihttps://creativecommons.org/licenses/by/4.0/
dc.contributor.orcidLin, Kai-Qiang [0000-0001-9609-749X]
dc.contributor.orcidOng, Chin Shen [0000-0001-8747-1849]
dc.contributor.orcidBange, Sebastian [0000-0002-5850-264X]
dc.contributor.orcidPeng, Bo [0000-0001-6406-663X]
dc.contributor.orcidWatanabe, Kenji [0000-0003-3701-8119]
dc.contributor.orcidTaniguchi, Takashi [0000-0002-1467-3105]
dc.contributor.orcidMonserrat, Bartomeu [0000-0002-4233-4071]
dc.contributor.orcidFabian, Jaroslav [0000-0002-3009-4525]
dc.contributor.orcidChernikov, Alexey [0000-0002-9213-2777]
dc.contributor.orcidLouie, Steven G [0000-0003-0622-0170]
dc.contributor.orcidLupton, John M [0000-0002-7899-7598]
pubs.funder-project-idDeutsche Forschungsgemeinschaft (314695032)
pubs.funder-project-idDeutsche Forschungsgemeinschaft (German Research Foundation) (314695032)


Files in this item

Thumbnail

This item appears in the following Collection(s)

Show simple item record

Attribution 4.0 International
Except where otherwise noted, this item's licence is described as Attribution 4.0 International