Magnetic topological insulators such as Cr-doped (Bi,Sb)2Te3 provide a platform for the realization of versatile time-reversal symmetry-breaking physics. By constructing heterostructures with N\'eel order in an antiferromagnetic CrSb and magnetic topological order in Cr-doped (Bi,Sb)2Te3, we realize emergent interfacial magnetic phenomena which can be tailored through artificial structural engineering. Through deliberate geometrical design of heterostructures and superlattices, we demonstrate the use of antiferromagnetic exchange coupling in manipulating the magnetic properties of the topological surface massive Dirac fermions. This work provides a new framework on integrating topological insulators with antiferromagnetic materials and unveils new avenues towards dissipationless topological antiferromagnetic spintronics.
@article{arxiv.1605.04854,
title = {Tailoring Exchange Couplings in Magnetic Topological Insulator/Antiferromagnet Heterostructures},
author = {Qing Lin He and Xufeng Kou and Alexander J. Grutter and Lei Pan and Xiaoyu Che and Yuxiang Liu and Tianxiao Nie and Steven M. Disseler and Brian J. Kirby and William Ratcliff and Qiming Shao and Koichi Murata and Yabin Fan and Mohammad Montazeri and Julie A. Borchers and Kang L. Wang},
journal= {arXiv preprint arXiv:1605.04854},
year = {2016}
}