# Detailed band structure of twinned and detwinned BaFe$_2$As$_2$ studied with angle-resolved photoemission spectroscopy

## TL;DR

This study uses ARPES to analyze the detailed band structure of twinned and detwinned BaFe$_2$As$_2$, revealing nematic splitting, magnetic folding, and providing a comprehensive understanding of its electronic structure.

## Contribution

It offers a detailed ARPES analysis of BaFe$_2$As$_2$, including new band assignments and insights into nematic and magnetic effects not previously reported.

## Key findings

- Observation of nematic splitting of $d_{xz}$ and $d_{yz}$ orbitals
- Identification of magnetic folding with wave vector $(\pi,\pi,\pi)$
- New assignment of electron bands differing from prior studies

## Abstract

We study the band structure of twinned and detwinned BaFe$_2$As$_2$ using angle-resolved photoemission spectroscopy (ARPES). The combination of measurements in the ordered and normal state along four high-symmetry momentum directions $\Gamma$/Z--X/Y enables us to identify the complex reconstructed band structure in the ordered state in great detail. We clearly observe the nematic splitting of the $d_{xz}$ and $d_{yz}$ orbitals as well as folding due to magnetic order with a wave vector of $(\pi,\pi,\pi)$. We are able to assign all observed bands. In particular we suggest an assignment of the electron bands different from previous reports. The high quality spectra allow us to achieve a comprehensive understanding of the band structure of BaFe$_2$As$_2$.