Fermi arcs and their topological character in the candidate type-II Weyl semimetal MoTe2

TL;DR

This study combines experimental ARPES measurements and theoretical calculations to identify and analyze Fermi arcs and their topological properties in the candidate type-II Weyl semimetal MoTe2, confirming its Weyl semimetal state.

Contribution

It provides the first combined experimental and theoretical evidence of Fermi arcs and topological Weyl points in MoTe2, supporting its classification as a type-II Weyl semimetal.

Findings

Multiple Fermi arcs observed on different surfaces

Experimental surface states match theoretical predictions

Weyl semimetal state with 8 type-II Weyl points confirmed

Abstract

We report a combined experimental and theoretical study of the candidate type-II Weyl semimetal MoTe2. Using laser-based angle-resolved photoemission we resolve multiple distinct Fermi arcs on the inequivalent top and bottom (001) surfaces. All surface states observed experimentally are reproduced by an electronic structure calculation for the experimental crystal structure that predicts a topological Weyl semimetal state with 8 type-II Weyl points. We further use systematic electronic structure calculations simulating different Weyl point arrangements to discuss the robustness of the identified Weyl semimetal state and the topological character of Fermi arcs in MoTe2.