Tunable anomalous Hall transport in bulk and two-dimensional 1T-CrTe2: A first-principles study

Layered materials with robust magnetic ordering have been attracting significant research interest. In recent experiments, a new layered material 1T-CrTe2 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-CrTe2, both in the bulk and in the two-dimensional limit. We show that 1T-CrTe2 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-CrTe2 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.

Automated summary

Layered material 1T-CrTe2 exhibits robust magnetic ordering and ferromagnetism above room temperature, with stable monolayer form and high Curie temperature. Interestingly, both bulk and monolayer 1T-CrTe2 show vanishing anomalous Hall effect in the ground state, but it can be enhanced by adjusting magnetization direction or applying uniaxial strains.