Abstract
Structural-inversion-asymmetry effects on charge carriers can be described by a spin-orbit (Rashba) effective magnetic field. The direction of this field is fixed by the carrier momentum and axis of asymmetry - properties that form the basis of the spin transistor. The authors have used a sensitive terahertz magnetophotoresponse method to probe electrons in an asymmetric quantum well of InAs in the integer quantum-Hall-effect regime. Remarkable multiple-line spin-resonance spectra are attributed to oppositely directed Rashba fields of electrons in counterpropagating quasi-one-dimensional channels on opposite sample edges. Similar effects might lead to ultrafast electric-field control of spins for any spin-polarized topological edge channels.
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