# Three-Dimensional Electronic Structure of type-II Weyl Semimetal WTe$_2$

## TL;DR

This study combines advanced spectroscopy and calculations to reveal the three-dimensional bulk electronic structure of WTe$_2$, a candidate type-II Weyl semimetal, highlighting its coherent electron transport across layers and the influence of electronic correlations.

## Contribution

It provides the first detailed bulk electronic structure of WTe$_2$ using soft-X-ray ARPES and first-principles calculations, emphasizing three-dimensional dispersion and correlation effects.

## Key findings

- Observation of three-dimensional electronic dispersion in WTe$_2$
- Identification of distinct electron and hole pockets at the Fermi surface
- Evidence of significant electronic correlation effects affecting the bulk electronic structure

## Abstract

By combining bulk sensitive soft-X-ray angular-resolved photoemission spectroscopy and accurate first-principles calculations we explored the bulk electronic properties of WTe$_2$, 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 $\Gamma$ 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 WTe$_2$ around the Fermi level to electronic correlations and renormalizations due to self-energy effects, previously neglected in first-principles descriptions.