Quantum anomalous Hall (QAH) effect is a quantum Hall effect that occurs without the need of external magnetic field. A system composed of multiple parallel QAH layers is an effective high Chern number QAH insulator and the key to the applications of the dissipationless chiral edge channels in low energy consumption electronics. Such a QAH multilayer can also be engineered into other exotic topological phases such as a magnetic Weyl semimetal with only one pair of Weyl points. This work reports the first experimental realization of QAH multilayers in the superlattices composed of magnetically doped (Bi,Sb)2Te3 topological insulator and CdSe normal insulator layers grown by molecular beam epitaxy. The obtained multilayer samples show quantized Hall resistance h/Ne2, where h is the Planck's constant, e is the elementary charge and N is the number of the magnetic topological insulator layers, resembling a high Chern number QAH insulator.
@article{arxiv.1806.05923,
title = {Quantum anomalous Hall multilayers grown by molecular beam epitaxy},
author = {Gaoyuan Jiang and Yang Feng and Weixiong Wu and Shaorui Li and Yunhe Bai and Yaoxin Li and Qinghua Zhang and Lin Gu and Xiao Feng and Ding Zhang and Canli Song and Lili Wang and Wei Li and Xu-Cun Ma and Qi-Kun Xue and Yayu Wang and Ke He},
journal= {arXiv preprint arXiv:1806.05923},
year = {2018}
}