2016

Tunable spin-charge conversion through topological phase transitions in zigzag nanoribbons

Tunable spin-charge conversion through topological phase transitions in zigzag nanoribbons
H. Li and A. Manchon
Phys. Rev. B 93, 235317 (2016)​
H. Li, A. Manchon
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2016
​We study spin-orbit torques and charge pumping in magnetic quasi-one-dimensional zigzag nanoribbons with a hexagonal lattice, in the presence of large intrinsic spin-orbit coupling. Such a system experiences a topological phase transition from a trivial band insulator to a quantum spin Hall insulator by tuning of either the magnetization direction or the intrinsic spin-orbit coupling. We find that the spin-charge conversion efficiency (i.e., spin-orbit torque and charge pumping) is dramatically enhanced at the topological transition, displaying a substantial angular anisotropy.