Title: The current progress of quantum anomalous Hall effect
Abstract:The anomalous Hall effect was first discovered in ferromagnetic metals, which originates from the spin-orbit coupling (SOC) between the current and magnetic moments. Recently, the quantum anomalous Hall (QAH) effect has been proposed in magnetic topological insulators [1-3], in which the anomalous Hall conductance is quantized to νe2/h (ν is an integer) without the orbital magnetic field and the associated Landau levels. In magnetic topological insulators, the SOC and ferromagnetic (FM) ordering combine to give rise to the topologically nontrivial band structure. The chiral edge states in the QAH state conduct current without dissipation, and could be used for interconnects of semiconductor devices. Following the theoretical guideline, the study of the QAH effect has made great progress in experiments [4-6]. In this talk, I would like to briefly review the current progress on this field from the perspective of both experiments and theories.
Reference:
[1] Liu et al. Phys. Rev. Lett. 101, 146802 (2008)
[2] Yu et al. Science 329, 61 (2010)
[3] Zhang et al. Phys. Rev. Lett. 112, 096804 (2014)
[4] Chang et al. Science 340, 167 (2013)
[5] Chang et al. Nat. Mater. 14, 473 (2015)
[6] Bestwick et al. Phys. Rev. Lett. 114, 187201 (2015)
