Topological Spin Texture in a Quantum Anomalous Hall Insulator

Jiansheng Wu, Jie Liu, Xiong-Jun Liu
2014 Physical Review Letters  
The quantum anomalous Hall (QAH) effect has been recently discovered in experiment using thin-film topological insulator with ferromagnetic ordering and strong spin-orbit coupling. Here we investigate the spin degree of freedom of a QAH insulator and uncover a fundamental phenomenon that the edge states exhibit topologically stable spin texture in the boundary when a chiral-like symmetry is present. This result shows that edge states are chiral in both the orbital and spin degrees of freedom,
more » ... d the chiral edge spin texture corresponds to the bulk topological states of the QAH insulator. We also study the potential applications of the edge spin texture in designing topological-state-based spin devices which might be applicable to future spintronic technologies.
doi:10.1103/physrevlett.113.136403 pmid:25302911 fatcat:a4n3ctyhp5cwnlbb5wvuhwuno4