Evidence of Coulomb interaction induced Lifshitz transition and robust hybrid Weyl semimetal in Td MoTe2

TL;DR

This study reveals that Coulomb interactions induce a Lifshitz transition in Td MoTe2, leading to a hybrid Weyl semimetal state with potential implications for its electronic and superconducting properties.

Contribution

It demonstrates the crucial role of Coulomb interactions in shaping the electronic structure and Weyl semimetal state of Td MoTe2, combining experimental spectroscopy with theoretical analysis.

Findings

Coulomb interaction causes a Lifshitz transition in Td MoTe2.

Identification of a hybrid Weyl semimetal state with type-I and type-II Weyl nodes.

Experimental data aligns with theoretical predictions of the electronic structure.

Abstract

Using soft x-ray angle-resolved photoemission spectroscopy we probed the bulk electronic structure of Td MoTe2. We found that on-site Coulomb interaction leads to a Lifshitz transition, which is essential for a precise description of the electronic structure. A hybrid Weyl semimetal state with a pair of energy bands touching at both type-I and type-II Weyl nodes is indicated by comparing the experimental data with theoretical calculations. Unveiling the importance of Coulomb interaction opens up a new route to comprehend the unique properties of MoTe2, and is significant for understanding the interplay between correlation effects, strong spin-orbit coupling and superconductivity in this van der Waals material.