Tunable anomalous Hall transport in bulk and two-dimensional <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:mn>1</mml:mn><mml:mi>T</mml:mi></mml:mrow><mml:mo>−</mml:mo><mml:msub><mml:mi mathvariant="normal">CrTe</mml:mi><mml:mn>2</mml:mn></mml:msub></mml:math>: A first-principles study
Si Li, Shan‐Shan Wang, Bo Tai, Weikang Wu, Bin Xiang, Xian‐Lei Sheng, Shengyuan A. Yang
Abstract
Layered materials with robust magnetic ordering have been attracting significant research interest. In recent experiments, a new layered material $1T\ensuremath{-}{\mathrm{CrTe}}_{2}$ 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 $1T\ensuremath{-}{\mathrm{CrTe}}_{2}$, both in the bulk and in the two-dimensional limit. We show that $1T\ensuremath{-}{\mathrm{CrTe}}_{2}$ can be stable in the monolayer form, and has a low exfoliation energy. The monolayer structure is an intrinsic ferromagnetic metal, which maintains a relatively high Curie temperature above 200 K. Particularly, we reveal interesting features in the anomalous Hall transport. We show that in the ground state, both bulk and monolayer $1T\ensuremath{-}{\mathrm{CrTe}}_{2}$ 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.