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

Autor(en)

Domenico Di Sante, Pranab Kumar Das, C. Bigi, Z. Ergönenc, Gürtler N., J. A. Krieger, T. Schmitt, M. N. Ali, Graziano Rossi, R. Thomale, C. Franchini, Silvia Picozzi, Jun Fujii, V. N. Strocov, G. Sangiovanni, I. Vobornik, R. J. Cava, G. Panaccione

Abstrakt

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 Gamma 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.

Organisation(en)

Computergestützte Materialphysik

Externe Organisation(en)

Julius-Maximilians-Universität Würzburg, Theory@Elettra, Abdus Salam International Centre for Theoretical Physics, National University of Singapore (NUS), Università degli Studi di Milano-Bicocca, Paul Scherrer Institute, Eidgenössische Technische Hochschule Zürich, Princeton University, Consiglio Nazionale delle Ricerche, Universität Wien

Journal

Physical Review Letters

Band

119

Anzahl der Seiten

6

ISSN

0031-9007

DOI

https://doi.org/10.1103/PhysRevLett.119.026403

Publikationsdatum

07-2017

Peer-reviewed

Ja

ÖFOS 2012

103025 Quantenmechanik, 103036 Theoretische Physik, 103015 Kondensierte Materie, 103009 Festkörperphysik

Schlagwörter

ASJC Scopus Sachgebiete

Allgemeine Physik und Astronomie

Link zum Portal

https://ucrisportal.univie.ac.at/de/publications/5816c369-aa2a-4aff-8d08-a1bd789c9f23