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Non-linear antidamping spin-orbit torque originating from intra-band transport on the warped surface of a topological insulator
- Publication Year :
- 2021
-
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 linear-response 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 which can exceed the intrinsic one by several orders of magnitude, depending on warping parameter and the position of Fermi energy, and exhibits a complex dependence on the azimuthal angle of the magnetization. This nonlinear SOT provides an alternative explanation of the observed giant SOT in recent experiments.<br />Comment: 9 pages, 4 figures
- Subjects :
- Condensed Matter - Mesoscale and Nanoscale Physics
81S99
Subjects
Details
- Database :
- arXiv
- Publication Type :
- Report
- Accession number :
- edsarx.2111.03397
- Document Type :
- Working Paper
- Full Text :
- https://doi.org/10.1103/PhysRevB.105.075415