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Three-Dimensional Electronic Structure of the Type-II Weyl Semimetal WTe2

Author(s): Di Sante, Domenico; Das, Pranab Kumar; Bigi, Chiara; Ergönenc, Zeynep; Gürtler, N.; et al

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Abstract: © 2017 American Physical Society. By combining bulk sensitive soft-x-ray angular-resolved photoemission spectroscopy and first-principles calculations we explored the bulk electron states of WTe2, a candidate type-II Weyl semimetal featuring a large nonsaturating magnetoresistance. Despite the layered geometry suggesting a two-dimensional electronic structure, we directly observe a three-dimensional electronic dispersion. We report a band dispersion in the reciprocal direction perpendicular to the layers, implying that electrons can also travel coherently when crossing from one layer to the other. The measured Fermi surface is characterized by two well-separated electron and hole pockets at either side of the Γ point, differently from previous more surface sensitive angle-resolved photoemission spectroscopy experiments that additionally found a pronounced quasiparticle weight at the zone center. Moreover, we observe a significant sensitivity of the bulk electronic structure of WTe2 around the Fermi level to electronic correlations and renormalizations due to self-energy effects, previously neglected in first-principles descriptions.
Publication Date: 14-Jul-2017
Citation: Di Sante, D., Das, PK, Bigi, C., Ergönenc, Z., Gürtler, N., Krieger, J.A., Schmitt, T., Ali, M.N., Rossi, G., Thomale, R., Franchini, C., Picozzi, S., Fujii, J., Strocov, V.N., Sangiovanni, G., Vobornik, I., Cava, R.J., Panaccione, G. (2017). Three-Dimensional Electronic Structure of the Type-II Weyl Semimetal WTe2. Physical Review Letters, 119 (2), 10.1103/PhysRevLett.119.026403
DOI: doi:10.1103/PhysRevLett.119.026403
ISSN: 0031-9007
EISSN: 1079-7114
Pages: 119.2:026403-1 -026403-6
Type of Material: Journal Article
Journal/Proceeding Title: Physical Review Letters
Version: Final published version. This is an open access article.
Notes: Physical Review Letters. Volume 119, Issue 2, 14 July 2017, Article number 026403.

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