We present the evolution of the electronic structure of CrSBr from its antiferromagnetic ground state to the paramagnetic phase above T_N=132 K, in both experiment and theory. Low temperature angle-resolved photoemission spectroscopy (ARPES) results are obtained using a novel method to overcome sample charging issues, revealing quasi-2D valence bands in the ground state. The results are very well reproduced by our QSG\^W calculations, which further identify certain bands at the X points to be exchange-split pairs of states with mainly Br and S character. By tracing band positions as a function of temperature, we show the splitting disappears above T_N. The energy splitting is interpreted as an effective exchange splitting in individual layers in which the Cr moments all align, within the so-called A-type antiferromagnetic arrangement. Our results lay firm foundations for the interpretation of the many other intriguing physical and optical properties of CrSBr.
@article{arxiv.2403.10867,
title = {Giant exchange splitting in the electronic structure of A-type 2D antiferromagnet CrSBr},
author = {Matthew D. Watson and Swagata Acharya and James E. Nunn and Laxman Nagireddy and Dimitar Pashov and Malte Rösner and Mark van Schilfgaarde and Neil R. Wilson and Cephise Cacho},
journal= {arXiv preprint arXiv:2403.10867},
year = {2024}
}
Comments
Published open access at https://doi.org/10.1038/s41699-024-00492-7 including supplementary information