Realization of quantum anomalous Hall effect from a magnetic Weyl semimetal.
The quantum anomalous Hall effect (QAHE) and magnetic Weyl semimetals (WSMs) are topological states induced by intrinsic magnetic moments and spin-orbital coupling. Their similarity suggests the possibility of achieving the QAHE by dimensional confinement of a magnetic WSM along one direction. In this study, we investigate the emergence of the QAHE in the two dimensional (2D) limit of magnetic WSMs due to finite size effects. We demonstrate the feasibility of this approach with effective models and real materials. To this end, we have chosen the layered magnetic WSM Co$_3$Sn$_2$S$_2$, which features large anomalous Hall conductivity and anomalous Hall angle in its 3D bulk, as our material candidate. In the 2D limit of Co$_3$Sn$_2$S$_2$ two QAHE states exist depending on the 2D layer stoichiometry. One is a semimetal with a Chern number of 6, and the other is an insulator with a Chern number of 3. The latter has a band gap of 0.05 eV, which is much larger than that in magnetically doped topological insulators. Since intrinsic ferromagnets normally have a higher magnetic ordering temperature than dilute magnetic semiconductors, the QAHE obtained from this WSM should be stable to a higher temperature. This temperature stability is one of the most important parameters for further applications of the QAHE.
Publisher URL: http://arxiv.org/abs/1712.08115
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