By combining bulk sensitive soft-X-ray angular-resolved photoemission spectroscopy and accurate first-principles calculations we explored the bulk electronic properties of WTe2, a candidate type-II Weyl semimetal featuring a large non-saturating magnetoresistance. Despite the layered geometry suggesting a two-dimensional electronic structure, we find a three-dimensional electronic dispersion. We report an evident 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 ARPES experiments that additionally found a significant 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.
@article{arxiv.1702.05322,
title = {Three-Dimensional Electronic Structure of type-II Weyl Semimetal WTe$_2$},
author = {Domenico Di Sante and Pranab Kumar Das and C. Bigi and Z. Ergönenc and N. Gürtler and J. A. Krieger and T. Schmitt and M. N. Ali and G. Rossi and R. Thomale and C. Franchini and S. Picozzi and J. Fujii and V. N. Strocov and G. Sangiovanni and I. Vobornik and R. J. Cava and G. Panaccione},
journal= {arXiv preprint arXiv:1702.05322},
year = {2017}
}