Tunable anomalous Hall transport in bulk and two-dimensional 1$T$-CrTe${}_2$: A first-principles study

Abstract

Layered materials with robust magnetic ordering have been attracting significant research interest. In recent experiments, a new layered material 1$T$-CrTe${}_2$ has been synthesized and exhibits ferromagnetism above the room temperature. Here, based on first-principles calculations, we investigate the electronic, magnetic, and transport properties of 1$T$-CrTe${}_2$, both in the bulk and in the two-dimensional (2D) limit. We show that 1$T$-CrTe${}_2$ can be stable in the monolayer form, and has a low exfoliation energy. The monolayer structure is an intrinsic ferromagnetic metal, which maintains a high Curie temperature above the room temperature. Particularly, we reveal interesting features in the anomalous Hall transport. We show that in the ground state, both bulk and monolayer 1$T$-CrTe${}_2$ possess vanishing anomalous Hall effect, because the magnetization preserves one vertical mirror symmetry. The anomalous Hall conductivity can be made sizable by tuning the magnetization direction or by uniaxial strains that break the mirror symmetry. The room-temperature 2D ferromagnetism and the tunable anomalous Hall effect make the material a promising platform for nanoscale device applications.

arXiv comment8 pages, 9 figures

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• Tunable magneto-optical effect, anomalous Hall effect and anomalous Nernst effect in two-dimensional room-temperature ferromagnet $1T$-CrTe${}_2$
• Structural, electronic, and magnetic properties of CrTe2
• Evidence of Kitaev interaction in the monolayer 1T-CrTe${}_2$
• Electrically tunable Gilbert damping in van der Waals heterostructures of two-dimensional ferromagnetic metals and ferroelectrics
• Magnetic properties of monolayer, multilayer, and bulk CrTe${}_2$
• Structure dependent and strain tunable magnetic ordering in ultrathin chromium telluride
• Many-body electronic structure, self-doped double-exchange, and Hund metallicity in 1T-CrTe2 bulk and monolayer