Evidence of Electron-Hole Imbalance in WTe 2 from High-Resolution Angle-Resolved Photoemission Spectroscopy
Open accessAbstract
WTe 2 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 WTe 2 . 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 WTe 2 . 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 WTe 2 . Our results provide new insight on understanding the origin of the unusual magnetoresistance in WTe 2 .
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Transport of Topological Semimetals
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Self-citation
- Authors
- 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., Jia, X.-W., Zhang, F.-F., Zhang, S.-J., Yang, F., Wang, Z.-M., Peng, Q.-J., Xu, Z.-Y., Chen, C.-T., & Zhou, X.-J.
- Affiliations
- Chinese Academy of Sciences (CN)
- Tulane University (US)
- Academy of Military Transportation (CN)
- ORCID
- Zhao, Lin
- Venue
- Chinese Physics Letters
- Publisher
- IOP Publishing
- Published
- 2017-08
- Volume
- 34
- Issue
- 9
- Pages
- 097305
- ISSN
- 0256-307X (ISSN-L)
- 1741-3540
- OpenAlex
- W2752205378
- Cited by
- 18
- References
- 26
- Citations by year
- 2026: 1 · 2025: 2 · 2024: 2 · 2023: 1 · 2022: 1 · 2021: 2 · 2020: 3 · 2019: 2 · 2018: 1 · 2017: 3
- FWCI
- 1.04
- Type
- journal article
- Language
- en
- Open access
- bronze
- doi.org
- Licence
- Locations
- Chinese Physics Letters (publishedVersion)
- arXiv (Cornell University) (submittedVersion)
- arXiv (Cornell University)
- Funders
- U.S. Department of Energy (DESC0014208)
- National Natural Science Foundation of China (2016YFA0300600, 11574367, 2015CB921300)
- Chinese Academy of Sciences (XDB07020300)
- National Key Research and Development Program of China (2016YFA0300600, 2015CB921300, 2013CB921904)
- Topics
- Physical Sciences › Materials Science › Materials Chemistry › 2D Materials and Applications
- Physical Sciences › Physics and Astronomy › Atomic and Molecular Physics, and Optics › Topological Materials and Phenomena
- Physical Sciences › Materials Science › Materials Chemistry › Graphene research and applications
- Keywords
- WTe2, electron-hole compensation, giant magnetoresistance, electronic structure, electron density, hole concentration, temperature dependence, flat bands, two-dimensional transition metal dichalcogenides, transport properties
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