Non-linear antidamping spin-orbit torque originating from intra-band transport on the warped surface of a topological insulator
Yong-Long Zhou,
Hou-Jian Duan,
Yong-jia Wu
et al.
Abstract:Motivated by recent experiments observing a large antidamping spin-orbit torque (SOT) on the surface of a three-dimensional topological insulator, we investigate the origin of the current-induced SOT beyond linearresponse theory. We find that a strong antidamping SOT arises from intraband transitions in non-linear response, and does not require interband transitions as is the case in linear transport mechanisms. The joint effect of warping and an in-plane magnetization generates a non-linear antidamping SOT wh… Show more
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