Measurements of electronic band structure in CeCoGe$_3$ by angle-resolved photoemission spectroscopy

TL;DR

This study uses ARPES to map CeCoGe$_3$'s electronic band structure, confirming theoretical predictions and discovering new surface and folded bands related to unit cell reconstruction.

Contribution

First comprehensive ARPES measurement of CeCoGe$_3$'s electronic structure, revealing surface states and folded bands not previously observed.

Findings

Electronic structure largely matches first principles calculations.

Identification of a surface state.

Observation of folded bands from unit cell reconstruction.

Abstract

We report a comprehensive study of the electronic structure of CeCoGe$_3$ throughout the entire Brillouin zone in the non-magnetic regime using angle-resolved photoemission spectroscopy (ARPES). The electronic structure agrees in large part with first principles calculations, including predicted topological nodal lines. Two new features in the band structure are also observed: a surface state and folded bands, the latter which is argued to originate from a unit cell reconstruction.