Two-dimensional antiferromagnetic Dirac fermions in monolayer TaCoTe${}_2$

Abstract

Dirac point in two-dimensional (2D) materials has been a fascinating subject of research. Recently, it has been theoretically predicted that Dirac point may also be stabilized in 2D magnetic systems. However, it remains a challenge to identify concrete 2D materials which host such magnetic Dirac point. Here, based on first-principles calculations and theoretical analysis, we propose a stable 2D material, the monolayers TaCoTe${}_2$, as an antiferromagnetic (AFM) 2D Dirac material. We show that it has an AFM ground state with an out-of-plane Néel vector. It hosts a pair of 2D AFM Dirac points on the Fermi level in the absence of spin-orbit coupling (SOC). When the SOC is considered, a small gap is opened at the original Dirac points. Meanwhile, another pair of Dirac points appear on the Brillouin zone boundary below the Fermi level, which are robust under SOC and have a type-II dispersion. Such a type-II AFM Dirac point has not been observed before. We further show that the location of this Dirac point as well as its dispersion type can be controlled by tuning the Néel vector orientation.

arXiv comment8 pages, 8 figures

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• Signatures of Lifshitz transition in the optical conductivity of two-dimensional tilted Dirac materials
• Type-II topological metals
• Discovery of a magnetic Dirac system with large intrinsic non-linear Hall effect
• Discovering two-dimensional magnetic topological insulators by machine learning
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• Polarizability, plasmons, and screening in 1T${}^{\prime }$-MoS${}_2$ with tilted Dirac bands
• Tilted Dirac Cones in Two-Dimensional Materials: Impact on Electron Transmission and Pseudospin Dynamics
• Two-dimensional Dirac semimetals with tunable edge states
• Designer gapped and tilted Dirac cones in lateral graphene superlattices