Publication: Controlling spin without magnetic fields: the Bloch-Rashba rotator
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2020-08-31
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American Physical Society
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Abstract
We consider the dynamics of a quantum particle held in a lattice potential and subjected to a time-dependent spin-orbit coupling. Tilting the lattice causes the particle to perform Bloch oscillations, and by suitably changing the Rashba interaction during its motion, the spin of the particle can be gradually rotated. Even if the Rashba coupling can only be altered by a small amount, large spin rotations can be obtained by accumulating the rotation from successive oscillations. We show how the time dependence of the spin-orbit coupling can be chosen to maximize the rotation per cycle, and thus how this method can be used to produce a precise and controllable spin rotator, which we term the Bloch-Rashba rotator, without requiring an applied magnetic field.
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©2020 American Physical Society
This work was supported by Spain's MINECO through Grant No. FIS2017-84368-P. The author thanks Toni Ramsak for introducing him to this to this problem, and Gloria Platero for stimulating discussions.