Evidence of Electron-Hole Imbalance in WTe2 from High-Resolution Angle-Resolved Photoemission Spectroscopy

Chen Lu Wang, Yan Zhang, Jian Wei Huang, Guo Dong Liu, Ai Ji Liang, Yu Xiao Zhang, Bing Shen, Jing Liu, Cheng Hu, Ying Ding, De Fa Liu, Yong Hu, Shao Long He, Lin Zhao, Li Yu, Jin Hu, Jiang Wei, Zhi Qiang Mao, You Guo Shi, Xiao Wen JiaFeng Feng Zhang, Shen Jin Zhang, Feng Yang, Zhi Min Wang, Qin Jun Peng, Zu Yan Xu, Chuang Tian Chen, Xing Jiang Zhou

Research output: Contribution to journalArticle

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Abstract

WTe2 has attracted a great deal of attention because it exhibits extremely large and non-saturating magnetoresistance. The underlying origin of such a giant magnetoresistance is still under debate. Utilizing laser-based angle-resolved photoemission spectroscopy with high energy and momentum resolutions, we reveal the complete electronic structure of WTe2. This makes it possible to determine accurately the electron and hole concentrations and their temperature dependence. We find that, with increasing the temperature, the overall electron concentration increases while the total hole concentration decreases. It indicates that the electron-hole compensation, if it exists, can only occur in a narrow temperature range, and in most of the temperature range there is an electron-hole imbalance. Our results are not consistent with the perfect electron-hole compensation picture that is commonly considered to be the cause of the unusual magnetoresistance in WTe2. We identify a flat band near the Brillouin zone center that is close to the Fermi level and exhibits a pronounced temperature dependence. Such a flat band can play an important role in dictating the transport properties of WTe2. Our results provide new insight on understanding the origin of the unusual magnetoresistance in WTe2.

Original languageEnglish (US)
Article number097305
JournalChinese Physics Letters
Volume34
Issue number9
DOIs
StatePublished - Aug 2017

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photoelectric emission
high resolution
spectroscopy
temperature dependence
Brillouin zones
temperature
electrons
transport properties
electronic structure
momentum
causes
lasers
energy

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

Cite this

Wang, C. L., Zhang, Y., Huang, J. W., Liu, G. D., Liang, A. J., Zhang, Y. X., ... Zhou, X. J. (2017). Evidence of Electron-Hole Imbalance in WTe2 from High-Resolution Angle-Resolved Photoemission Spectroscopy. Chinese Physics Letters, 34(9), [097305]. https://doi.org/10.1088/0256-307X/34/9/097305
Wang, Chen Lu ; Zhang, Yan ; Huang, Jian Wei ; Liu, Guo Dong ; Liang, Ai Ji ; Zhang, Yu Xiao ; Shen, Bing ; Liu, Jing ; Hu, Cheng ; Ding, Ying ; Liu, De Fa ; Hu, Yong ; He, Shao Long ; Zhao, Lin ; Yu, Li ; Hu, Jin ; Wei, Jiang ; Mao, Zhi Qiang ; Shi, You Guo ; Jia, Xiao Wen ; Zhang, Feng Feng ; Zhang, Shen Jin ; Yang, Feng ; Wang, Zhi Min ; Peng, Qin Jun ; Xu, Zu Yan ; Chen, Chuang Tian ; Zhou, Xing Jiang. / Evidence of Electron-Hole Imbalance in WTe2 from High-Resolution Angle-Resolved Photoemission Spectroscopy. In: Chinese Physics Letters. 2017 ; Vol. 34, No. 9.
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title = "Evidence of Electron-Hole Imbalance in WTe2 from High-Resolution Angle-Resolved Photoemission Spectroscopy",
abstract = "WTe2 has attracted a great deal of attention because it exhibits extremely large and non-saturating magnetoresistance. The underlying origin of such a giant magnetoresistance is still under debate. Utilizing laser-based angle-resolved photoemission spectroscopy with high energy and momentum resolutions, we reveal the complete electronic structure of WTe2. This makes it possible to determine accurately the electron and hole concentrations and their temperature dependence. We find that, with increasing the temperature, the overall electron concentration increases while the total hole concentration decreases. It indicates that the electron-hole compensation, if it exists, can only occur in a narrow temperature range, and in most of the temperature range there is an electron-hole imbalance. Our results are not consistent with the perfect electron-hole compensation picture that is commonly considered to be the cause of the unusual magnetoresistance in WTe2. We identify a flat band near the Brillouin zone center that is close to the Fermi level and exhibits a pronounced temperature dependence. Such a flat band can play an important role in dictating the transport properties of WTe2. Our results provide new insight on understanding the origin of the unusual magnetoresistance in WTe2.",
author = "Wang, {Chen Lu} and Yan Zhang and Huang, {Jian Wei} and Liu, {Guo Dong} and Liang, {Ai Ji} and Zhang, {Yu Xiao} and Bing Shen and Jing Liu and Cheng Hu and Ying Ding and Liu, {De Fa} and Yong Hu and He, {Shao Long} and Lin Zhao and Li Yu and Jin Hu and Jiang Wei and Mao, {Zhi Qiang} and Shi, {You Guo} and Jia, {Xiao Wen} and Zhang, {Feng Feng} and Zhang, {Shen Jin} and Feng Yang and Wang, {Zhi Min} and Peng, {Qin Jun} and Xu, {Zu Yan} and Chen, {Chuang Tian} and Zhou, {Xing Jiang}",
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Wang, CL, Zhang, Y, Huang, JW, Liu, GD, Liang, AJ, Zhang, YX, Shen, B, Liu, J, Hu, C, Ding, Y, Liu, DF, Hu, Y, He, SL, Zhao, L, Yu, L, Hu, J, Wei, J, Mao, ZQ, Shi, YG, Jia, XW, Zhang, FF, Zhang, SJ, Yang, F, Wang, ZM, Peng, QJ, Xu, ZY, Chen, CT & Zhou, XJ 2017, 'Evidence of Electron-Hole Imbalance in WTe2 from High-Resolution Angle-Resolved Photoemission Spectroscopy', Chinese Physics Letters, vol. 34, no. 9, 097305. https://doi.org/10.1088/0256-307X/34/9/097305

Evidence of Electron-Hole Imbalance in WTe2 from High-Resolution Angle-Resolved Photoemission Spectroscopy. / Wang, Chen Lu; Zhang, Yan; Huang, Jian Wei; Liu, Guo Dong; Liang, Ai Ji; Zhang, Yu Xiao; Shen, Bing; Liu, Jing; Hu, Cheng; Ding, Ying; Liu, De Fa; Hu, Yong; He, Shao Long; Zhao, Lin; Yu, Li; Hu, Jin; Wei, Jiang; Mao, Zhi Qiang; Shi, You Guo; Jia, Xiao Wen; Zhang, Feng Feng; Zhang, Shen Jin; Yang, Feng; Wang, Zhi Min; Peng, Qin Jun; Xu, Zu Yan; Chen, Chuang Tian; Zhou, Xing Jiang.

In: Chinese Physics Letters, Vol. 34, No. 9, 097305, 08.2017.

Research output: Contribution to journalArticle

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AU - Wang, Chen Lu

AU - Zhang, Yan

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AU - Liu, Guo Dong

AU - Liang, Ai Ji

AU - Zhang, Yu Xiao

AU - Shen, Bing

AU - Liu, Jing

AU - Hu, Cheng

AU - Ding, Ying

AU - Liu, De Fa

AU - Hu, Yong

AU - He, Shao Long

AU - Zhao, Lin

AU - Yu, Li

AU - Hu, Jin

AU - Wei, Jiang

AU - Mao, Zhi Qiang

AU - Shi, You Guo

AU - Jia, Xiao Wen

AU - Zhang, Feng Feng

AU - Zhang, Shen Jin

AU - Yang, Feng

AU - Wang, Zhi Min

AU - Peng, Qin Jun

AU - Xu, Zu Yan

AU - Chen, Chuang Tian

AU - Zhou, Xing Jiang

PY - 2017/8

Y1 - 2017/8

N2 - WTe2 has attracted a great deal of attention because it exhibits extremely large and non-saturating magnetoresistance. The underlying origin of such a giant magnetoresistance is still under debate. Utilizing laser-based angle-resolved photoemission spectroscopy with high energy and momentum resolutions, we reveal the complete electronic structure of WTe2. This makes it possible to determine accurately the electron and hole concentrations and their temperature dependence. We find that, with increasing the temperature, the overall electron concentration increases while the total hole concentration decreases. It indicates that the electron-hole compensation, if it exists, can only occur in a narrow temperature range, and in most of the temperature range there is an electron-hole imbalance. Our results are not consistent with the perfect electron-hole compensation picture that is commonly considered to be the cause of the unusual magnetoresistance in WTe2. We identify a flat band near the Brillouin zone center that is close to the Fermi level and exhibits a pronounced temperature dependence. Such a flat band can play an important role in dictating the transport properties of WTe2. Our results provide new insight on understanding the origin of the unusual magnetoresistance in WTe2.

AB - WTe2 has attracted a great deal of attention because it exhibits extremely large and non-saturating magnetoresistance. The underlying origin of such a giant magnetoresistance is still under debate. Utilizing laser-based angle-resolved photoemission spectroscopy with high energy and momentum resolutions, we reveal the complete electronic structure of WTe2. This makes it possible to determine accurately the electron and hole concentrations and their temperature dependence. We find that, with increasing the temperature, the overall electron concentration increases while the total hole concentration decreases. It indicates that the electron-hole compensation, if it exists, can only occur in a narrow temperature range, and in most of the temperature range there is an electron-hole imbalance. Our results are not consistent with the perfect electron-hole compensation picture that is commonly considered to be the cause of the unusual magnetoresistance in WTe2. We identify a flat band near the Brillouin zone center that is close to the Fermi level and exhibits a pronounced temperature dependence. Such a flat band can play an important role in dictating the transport properties of WTe2. Our results provide new insight on understanding the origin of the unusual magnetoresistance in WTe2.

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