Probing Critical Point Energies of Transition Metal Dichalcogenides: Surprising Indirect Gap of Single Layer WSe 2

Handle URI:
http://hdl.handle.net/10754/622358
Title:
Probing Critical Point Energies of Transition Metal Dichalcogenides: Surprising Indirect Gap of Single Layer WSe 2
Authors:
Zhang, Chendong; Chen, Yuxuan; Johnson, Amber; Li, Ming-yang; Li, Lain-Jong ( 0000-0002-4059-7783 ) ; Mende, Patrick C.; Feenstra, Randall M.; Shih, Chih Kang
Abstract:
By using a comprehensive form of scanning tunneling spectroscopy, we have revealed detailed quasi-particle electronic structures in transition metal dichalcogenides, including the quasi-particle gaps, critical point energy locations, and their origins in the Brillouin zones. We show that single layer WSe surprisingly has an indirect quasi-particle gap with the conduction band minimum located at the Q-point (instead of K), albeit the two states are nearly degenerate. We have further observed rich quasi-particle electronic structures of transition metal dichalcogenides as a function of atomic structures and spin-orbit couplings. Such a local probe for detailed electronic structures in conduction and valence bands will be ideal to investigate how electronic structures of transition metal dichalcogenides are influenced by variations of local environment.
KAUST Department:
Physical Sciences and Engineering (PSE) Division
Citation:
Zhang C, Chen Y, Johnson A, Li M-Y, Li L-J, et al. (2015) Probing Critical Point Energies of Transition Metal Dichalcogenides: Surprising Indirect Gap of Single Layer WSe2. Nano Letters 15: 6494–6500. Available: http://dx.doi.org/10.1021/acs.nanolett.5b01968.
Publisher:
American Chemical Society (ACS)
Journal:
Nano Letters
Issue Date:
21-Sep-2015
DOI:
10.1021/acs.nanolett.5b01968
PubMed ID:
26389585
Type:
Article
ISSN:
1530-6984; 1530-6992
Sponsors:
This research was supported with grants from the Welch Foundation (F-1672), and the U.S. National Science Foundation (DMR-1306878 and DMR-1205275). L.J.L. thanks the support from Academia Sinica Taiwan, AOARD-134137 U.S.A. and KAUST, Saudi Arabia. C.K.S also thanks the partially supported by the NT 3.0 Program, Ministry of Education, Taiwan for a visitng professorship at the National Tsing-Hua University. We also thank useful discussions with Professor Wang Yao of Hong Kong University.
Appears in Collections:
Articles; Physical Sciences and Engineering (PSE) Division

Full metadata record

DC FieldValue Language
dc.contributor.authorZhang, Chendongen
dc.contributor.authorChen, Yuxuanen
dc.contributor.authorJohnson, Amberen
dc.contributor.authorLi, Ming-yangen
dc.contributor.authorLi, Lain-Jongen
dc.contributor.authorMende, Patrick C.en
dc.contributor.authorFeenstra, Randall M.en
dc.contributor.authorShih, Chih Kangen
dc.date.accessioned2017-01-02T09:28:26Z-
dc.date.available2017-01-02T09:28:26Z-
dc.date.issued2015-09-21en
dc.identifier.citationZhang C, Chen Y, Johnson A, Li M-Y, Li L-J, et al. (2015) Probing Critical Point Energies of Transition Metal Dichalcogenides: Surprising Indirect Gap of Single Layer WSe2. Nano Letters 15: 6494–6500. Available: http://dx.doi.org/10.1021/acs.nanolett.5b01968.en
dc.identifier.issn1530-6984en
dc.identifier.issn1530-6992en
dc.identifier.pmid26389585en
dc.identifier.doi10.1021/acs.nanolett.5b01968en
dc.identifier.urihttp://hdl.handle.net/10754/622358-
dc.description.abstractBy using a comprehensive form of scanning tunneling spectroscopy, we have revealed detailed quasi-particle electronic structures in transition metal dichalcogenides, including the quasi-particle gaps, critical point energy locations, and their origins in the Brillouin zones. We show that single layer WSe surprisingly has an indirect quasi-particle gap with the conduction band minimum located at the Q-point (instead of K), albeit the two states are nearly degenerate. We have further observed rich quasi-particle electronic structures of transition metal dichalcogenides as a function of atomic structures and spin-orbit couplings. Such a local probe for detailed electronic structures in conduction and valence bands will be ideal to investigate how electronic structures of transition metal dichalcogenides are influenced by variations of local environment.en
dc.description.sponsorshipThis research was supported with grants from the Welch Foundation (F-1672), and the U.S. National Science Foundation (DMR-1306878 and DMR-1205275). L.J.L. thanks the support from Academia Sinica Taiwan, AOARD-134137 U.S.A. and KAUST, Saudi Arabia. C.K.S also thanks the partially supported by the NT 3.0 Program, Ministry of Education, Taiwan for a visitng professorship at the National Tsing-Hua University. We also thank useful discussions with Professor Wang Yao of Hong Kong University.en
dc.publisherAmerican Chemical Society (ACS)en
dc.subjectcritical points in Brillouin zonesen
dc.subjectinterlayer couplingen
dc.subjectscanning tunneling spectroscopyen
dc.subjectspin-orbit couplingen
dc.subjectTransition metal dichalcogenidesen
dc.subjectvariable Z spectroscopyen
dc.titleProbing Critical Point Energies of Transition Metal Dichalcogenides: Surprising Indirect Gap of Single Layer WSe 2en
dc.typeArticleen
dc.contributor.departmentPhysical Sciences and Engineering (PSE) Divisionen
dc.identifier.journalNano Lettersen
dc.contributor.institutionDepartment of Physics, University of Texas at Austin, Austin, TX, 78712, United Statesen
dc.contributor.institutionInstitute of Atomic and Molecular Sciences, Academia Sinica, No. 1, Roosevelt Road, Section 4, Taipei, 10617, Taiwanen
dc.contributor.institutionDepartment of Physics, Carnegie Mellon University, Pittsburgh, PA, 15213, United Statesen
kaust.authorLi, Ming-yangen
kaust.authorLi, Lain-Jongen

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