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

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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

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

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    Wang, C. L., Zhang, Y., Huang, J. W., Liu, G. D., Liang, A. J., Zhang, Y. X., Shen, B., Liu, J., Hu, C., Ding, Y., Liu, D. F., Hu, Y., He, S. L., Zhao, L., Yu, L., Hu, J., Wei, J., Mao, Z. Q., Shi, Y. G., ... 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