Discovery of a Magnetic Dirac System with a Large Intrinsic Nonlinear Hall Effect.
basic_science · Level V
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- Record sourced from PubMed, PMID 36689192.
- Also identified by DOI 10.1021/acs.nanolett.2c04194 and PMC identifier 10064332.
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Abstract
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 TaCoTe<sub>2</sub> via angle-resolved photoelectron spectroscopy and first-principles density functional theory 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 nonlinear Hall conductivity. Remarkably, we find that the latter is extremely sensitive to the orientation of the Néel vector, suggesting TaCoTe<sub>2</sub> as a suitable candidate for the realization of non-volatile spintronic devices with an unprecedented level of intrinsic tunability.