# Band splitting and Weyl nodes in trigonal tellurium studied by angle-resolved photoemission spectroscopy and density functional theory

## TL;DR

This study combines ARPES measurements and density functional theory to reveal band splitting, Weyl nodes, and spin-polarized pockets in trigonal tellurium, highlighting the influence of crystal chirality on electronic properties.

## Contribution

It provides direct experimental evidence of band splitting and Weyl nodes in trigonal tellurium, linking crystal chirality to topological electronic features.

## Key findings

- Evidence of band splitting due to crystal chirality
- Identification of Weyl nodes near the H point
- Detection of tiny spin-polarized hole pockets

## Abstract

We have performed high-resolution angle-resolved photoemission spectroscopy (ARPES) on trigonal tellurium consisting of helical chains in the crystal. Through the band-structure mapping in the three-dimensional Brillouin zone, we found a definitive evidence for the band splitting originating from the chiral nature of crystal. A direct comparison of the band dispersion between the ARPES results and the first-principles band-structure calculations suggests the presence of Weyl nodes and tiny spin-polarized hole pockets around the H point. The present result opens a pathway toward studying the interplay among crystal symmetry, band structure, and exotic physical properties in chiral crystals.