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Article: Electrical control of neutral and charged excitons in a monolayer semiconductor

TitleElectrical control of neutral and charged excitons in a monolayer semiconductor
Authors
Issue Date2013
PublisherNature Publishing Group. The Journal's web site is located at http://www.nature.com/ncomms/index.html
Citation
Nature Communications, 2013, v. 4, p. 1474 How to Cite?
AbstractMonolayer group-VI transition metal dichalcogenides have recently emerged as semiconducting alternatives to graphene in which the true two-dimensionality is expected to illuminate new semiconducting physics. Here we investigate excitons and trions (their singly charged counterparts), which have thus far been challenging to generate and control in the ultimate two-dimensional limit. Utilizing high-quality monolayer molybdenum diselenide, we report the unambiguous observation and electrostatic tunability of charging effects in positively charged (X +), neutral (X o) and negatively charged (X -) excitons in field-effect transistors via photoluminescence. The trion charging energy is large (30 meV), enhanced by strong confinement and heavy effective masses, whereas the linewidth is narrow (5 meV) at temperatures <55 K. This is greater spectral contrast than in any known quasi-two-dimensional system. We also find the charging energies for X + and X - to be nearly identical implying the same effective mass for electrons and holes. © 2013 Macmillan Publishers Limited.
Persistent Identifierhttp://hdl.handle.net/10722/186157
ISI Accession Number ID

 

DC FieldValueLanguage
dc.contributor.authorRoss, J. S.en_US
dc.contributor.authorWu, S.en_US
dc.contributor.authorYu, Hen_US
dc.contributor.authorGhimire, N. J.en_US
dc.contributor.authorJones, A. M.en_US
dc.contributor.authorAivazian, G.en_US
dc.contributor.authorYan, J.en_US
dc.contributor.authorMandrus, D. G.en_US
dc.contributor.authorXiao, D.en_US
dc.contributor.authorYao, Wen_US
dc.contributor.authorXu, X.en_US
dc.date.accessioned2013-08-20T11:57:23Z-
dc.date.available2013-08-20T11:57:23Z-
dc.date.issued2013en_US
dc.identifier.citationNature Communications, 2013, v. 4, p. 1474en_US
dc.identifier.urihttp://hdl.handle.net/10722/186157-
dc.description.abstractMonolayer group-VI transition metal dichalcogenides have recently emerged as semiconducting alternatives to graphene in which the true two-dimensionality is expected to illuminate new semiconducting physics. Here we investigate excitons and trions (their singly charged counterparts), which have thus far been challenging to generate and control in the ultimate two-dimensional limit. Utilizing high-quality monolayer molybdenum diselenide, we report the unambiguous observation and electrostatic tunability of charging effects in positively charged (X +), neutral (X o) and negatively charged (X -) excitons in field-effect transistors via photoluminescence. The trion charging energy is large (30 meV), enhanced by strong confinement and heavy effective masses, whereas the linewidth is narrow (5 meV) at temperatures <55 K. This is greater spectral contrast than in any known quasi-two-dimensional system. We also find the charging energies for X + and X - to be nearly identical implying the same effective mass for electrons and holes. © 2013 Macmillan Publishers Limited.-
dc.languageengen_US
dc.publisherNature Publishing Group. The Journal's web site is located at http://www.nature.com/ncomms/index.htmlen_US
dc.relation.ispartofNature Communicationsen_US
dc.rightsCreative Commons: Attribution 3.0 Hong Kong License-
dc.titleElectrical control of neutral and charged excitons in a monolayer semiconductoren_US
dc.typeArticleen_US
dc.identifier.emailYu, H: yuhongyi@hku.hken_US
dc.identifier.emailYao, W: wangyao@hku.hken_US
dc.identifier.authorityYao, W=rp00827en_US
dc.description.naturepostprint-
dc.identifier.doi10.1038/ncomms2498-
dc.identifier.pmid23403575-
dc.identifier.scopuseid_2-s2.0-84874582246-
dc.identifier.hkuros217829en_US
dc.identifier.volume4en_US
dc.identifier.spage1474en_US
dc.identifier.epage1474en_US
dc.identifier.isiWOS:000316616400044-

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