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

Chendong Zhang; Yuxuan Chen; Amber Johnson; Ming-yang Li; Lain-Jong Li; Patrick C. Mende; Randall M. Feenstra; Chih Kang Shih

doi:10.1021/acs.nanolett.5b01968

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

Chendong Zhang, Yuxuan Chen, Amber Johnson, Ming-yang Li, Lain-Jong Li, Patrick C. Mende, Randall M. Feenstra, Chih Kang Shih

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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.

Original language	English (US)
Pages (from-to)	6494-6500
Number of pages	7
Journal	Nano Letters
Volume	15
Issue number	10
DOIs	https://doi.org/10.1021/acs.nanolett.5b01968
State	Published - Sep 25 2015

Bibliographical note

KAUST Repository Item: Exported on 2020-10-01
Acknowledgements: 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.

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

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.",

author = "Chendong Zhang and Yuxuan Chen and Amber Johnson and Ming-yang Li and Lain-Jong Li and Mende, {Patrick C.} and Feenstra, {Randall M.} and Shih, {Chih Kang}",

note = "KAUST Repository Item: Exported on 2020-10-01 Acknowledgements: 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.",

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doi = "10.1021/acs.nanolett.5b01968",

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AU - Zhang, Chendong

AU - Chen, Yuxuan

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AU - Li, Ming-yang

AU - Li, Lain-Jong

AU - Mende, Patrick C.

AU - Feenstra, Randall M.

AU - Shih, Chih Kang

N1 - KAUST Repository Item: Exported on 2020-10-01 Acknowledgements: 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.

PY - 2015/9/25

Y1 - 2015/9/25

N2 - 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.

AB - 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.

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JO - Nano Letters

JF - Nano Letters

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ER -

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

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