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Evidence of Electron-Hole Imbalance in WTe2 from High-Resolution Angle-Resolved Photoemission Spectroscopy
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作者 Chen-Lu Wang Yan Zhang +25 位作者 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 Jia Feng-Feng Zhang Shen-Jin Zhang Feng Yang Zhi-Min Wang Qin-Jun Peng Zu-Yan Xu Chuang-Tian Chen Xing-Jiang Zhou 《Chinese Physics Letters》 SCIE CAS CSCD 2017年第9期100-104,共5页
WTe2 has attracted a great deal of attention because it exhibits extremely large and non-saturating magnetore- sistance. The underlying origin of such a giant magnetoresistance is still under debate. Utilizing laser-b... WTe2 has attracted a great deal of attention because it exhibits extremely large and non-saturating magnetore- sistance. 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 concen- tration 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 fiat band near the Brillouin zone center that is close to the Fermi level and exhibits a pronounced temperature dependence. Such a fiat 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. 展开更多
关键词 Evidence of Electron-Hole Imbalance in WTe2 from High-Resolution Angle-Resolved Photoemission Spectroscopy ARPES
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