Temperature Dependent Electronic Structure in a Higher Order Topological Insulator Candidate EuIn$_2$As$_2$
Abstract
The higher order topological insulator (HOTI) has enticed enormous research interests owing to its novelty in supporting gapless states along the hinges of the crystal. Despite several theoretical predictions, enough experimental confirmation of HOTI state in crystalline solids is still lacking. It has been well known that interplay between topology and magnetism can give rise to various magnetic topological states including HOTI and Axion insulator states. Here using the high-resolution angle-resolved photoemission spectroscopy (ARPES) combined with the first-principles calculations, we report a systematic study on the electronic band topology across the magnetic phase transition in EuIn2As2 which possesses an antiferromagnetic ground state below 16 K. Antiferromagnetic EuIn2As2 has been predicted to host both the Axion insulator and HOTI phase. Our experimental results show the clear signature of the evolution of the topological state across the magnetic transition. Our study thus especially suited to understand the interaction of higher order topology with magnetism in materials.
Keywords
Cite
@article{arxiv.1911.03703,
title = {Temperature Dependent Electronic Structure in a Higher Order Topological Insulator Candidate EuIn$_2$As$_2$},
author = {Sabin Regmi and Md Mofazzel Hosen and Barun Ghosh and Bahadur Singh and Gyanendra Dhakal and Christopher Sims and Baokai Wang and Firoza Kabir and Klauss Dimitri and Yangyang Liu and Amit Agarwal and Hsin Lin and Dariusz Kaczorowski and Arun Bansil and Madhab Neupane},
journal= {arXiv preprint arXiv:1911.03703},
year = {2020}
}
Comments
6 pages, 4 figures