Abstract
Electron spin transport through an Aharonov–Bohm ring driven bytime-dependent inhomogeneous magnetic fields is treated. The system possesses ansu(2)l × su(2)s dynamical symmetry in both orbital angular momentum space and spin space, and is thusproved to be integrable according to algebraic dynamics. Based on the analyticalsolutions, the relevant physical quantities such as electric current, spin current,magnetization and conductance are calculated. It is found that for a magnetic field withπ/2 twist angle, the direction of spin-polarization will be reversed at zero magnetic flux. In theresonant rotating magnetic field, the spin transmission is oscillating with timet, and can reach unity, so that a complete spin flip can also be induced. The results obtainedmay be of practical significance for the design of nano-electromagnetic spin devices, such asa spin switch, in a controllable way.
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