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dc.contributor.authorHsu, Wei-Ting
dc.contributor.authorLu, Li-Syuan
dc.contributor.authorWang, Dean
dc.contributor.authorHuang, Jing-Kai
dc.contributor.authorLi, Ming-yang
dc.contributor.authorChang, Tay-Rong
dc.contributor.authorChou, Yi-Chia
dc.contributor.authorJuang, Zhen-Yu
dc.contributor.authorJeng, Horng-Tay
dc.contributor.authorLi, Lain-Jong
dc.contributor.authorChang, Wen-Hao
dc.date.accessioned2017-10-17T08:48:35Z
dc.date.available2017-10-17T08:48:35Z
dc.date.issued2017-10-09
dc.identifier.citationHsu W-T, Lu L-S, Wang D, Huang J-K, Li M-Y, et al. (2017) Evidence of indirect gap in monolayer WSe2 . Nature Communications 8. Available: http://dx.doi.org/10.1038/s41467-017-01012-6.
dc.identifier.issn2041-1723
dc.identifier.pmid29030548
dc.identifier.doi10.1038/s41467-017-01012-6
dc.identifier.urihttp://hdl.handle.net/10754/625868
dc.description.abstractMonolayer transition metal dichalcogenides, such as MoS2 and WSe2, have been known as direct gap semiconductors and emerged as new optically active materials for novel device applications. Here we reexamine their direct gap properties by investigating the strain effects on the photoluminescence of monolayer MoS2 and WSe2. Instead of applying stress, we investigate the strain effects by imaging the direct exciton populations in monolayer WSe2–MoS2 and MoSe2–WSe2 lateral heterojunctions with inherent strain inhomogeneity. We find that unstrained monolayer WSe2 is actually an indirect gap material, as manifested in the observed photoluminescence intensity–energy correlation, from which the difference between the direct and indirect optical gaps can be extracted by analyzing the exciton thermal populations. Our findings combined with the estimated exciton binding energy further indicate that monolayer WSe2 exhibits an indirect quasiparticle gap, which has to be reconsidered in further studies for its fundamental properties and device applications.
dc.description.sponsorshipThis work was supported by the Ministry of Science and Technology (MOST) of Taiwan (MOST-104-2628-M-009-002-MY3, MOST-105-2119-M-009-014-MY3) and AOARD (FA2386-16-1-4035). W.-H.C. acknowledges the supports from the Center for Interdisciplinary Science of NCTU. T.-R.C. acknowledges the supports from MOST and NCKU. H.-T.J. acknowledges the supports from MOST, NTHU and Academia Sinica. T.-R.C. and H.-T.J. also thank NCHC, CINC-NTU and NCTS for technical supports.
dc.publisherSpringer Nature
dc.relation.urlhttps://www.nature.com/articles/s41467-017-01012-6
dc.rightsThis article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/
dc.titleEvidence of indirect gap in monolayer WSe2
dc.typeArticle
dc.contributor.departmentPhysical Sciences and Engineering (PSE) Division
dc.identifier.journalNature Communications
dc.eprint.versionPublisher's Version/PDF
dc.contributor.institutionDepartment of Electrophysics, National Chiao Tung University, Hsinchu, 30010, Taiwan
dc.contributor.institutionResearch Center for Applied Sciences, Academia Sinica, Taipei, 10617, Taiwan
dc.contributor.institutionDepartment of Physics, National Cheng Kung University, Tainan, 70101, Taiwan
dc.contributor.institutionDepartment of Physics, National Tsing Hua University, Hsinchu, 30013, Taiwan
kaust.personHuang, Jing-Kai
kaust.personLi, Lain-Jong
refterms.dateFOA2018-06-14T02:14:48Z


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This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.
Except where otherwise noted, this item's license is described as This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.