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Designer Topological Insulators in Superlattices
Xiao Li, Fan Zhang, Qian Niu +1
Gapless Dirac surface states are protected at the interface of topological and normal band insulators. In a binary superlattice bearing such interfaces, we establish that valley-de…
Anomalous Hall effect arising from noncollinear antiferromagnetism
Hua Chen, Qian Niu, A. H. MacDonald
In most conductors current flow perpendicular to electric field direction (Hall current) can be explained in terms of the Lorentz forces present when charged particles flow in an e…
Magnetic control of the valley degree of freedom of massive Dirac fermions with application to transition metal dichalcogenides
Tianyi Cai, Shengyuan A. Yang, Xiao Li +4
We study the valley-dependent magnetic and transport properties of massive Dirac fermions in multivalley systems such as the transition metal dichalcogenides. The asymmetry of the…
Angular Momentum of Phonons and Einstein-de Haas Effect
Lifa Zhang, Qian Niu
We study angular momentum of phonons in a magnetic crystal. In the presence of a spin-phonon interaction, we obtain a nonzero angular momentum of phonons, which is an odd function…
Dynamics of Antiferromagnets Driven by Spin Current
Ran Cheng, Qian Niu
When a spin-polarized current flows through a ferromagnetic (FM) metal, angular momentum is transferred to the background magnetization via spin-transfer torques. In antiferromagne…
Current partition at topological zero-line intersections
Zhenhua Qiao, Jeil Jung, Chungwei Lin +2
An intersection between one-dimensional chiral acts as a topological current splitter. We find that the splitting of a chiral zero-line mode obeys very simple, yet highly counterin…