Magnetic materials exhibiting topological Dirac fermions are attracting significant attention for their promising technological potential in spintronics. In these systems, the combined effect of the spin-orbit coupling and magnetic order enables the realization of novel topological phases with exotic transport properties, including the anomalous Hall effect and magneto-chiral phenomena. Herein, we report experimental signature of topological Dirac antiferromagnetism in TaCoTe2 via angle-resolved photoelectron spectroscopy (ARPES) and first-principles density functional theory (DFT) calculations. In particular, we find the existence of spin-orbit coupling-induced gaps at the Fermi level, consistent with the manifestation of a large intrinsic non-linear Hall conductivity. Remarkably, we find that the latter is extremely sensitive to the orientation of the N\'eel vector, suggesting TaCoTe2 a suitable candidate for the realization of non-volatile spintronic devices with an unprecedented level of intrinsic tunability.
@article{arxiv.2301.08927,
title = {Discovery of a magnetic Dirac system with large intrinsic non-linear Hall effect},
author = {Federico Mazzola and Barun Ghosh and Jun Fujii and Gokul Acharya and Debashis Mondal and Giorgio Rossi and Arun Bansil and Daniel Farias and Jin Hu and Amit Agarwal and Antonio Politano and Ivana Vobornik},
journal= {arXiv preprint arXiv:2301.08927},
year = {2023}
}