Frustaglia, Diego and Hentschel, Martina and Richter, Klaus
Quantum Transport in Nonuniform Magnetic Fields: Aharonov-Bohm Ring as a Spin Switch.
Physical Review Letters 87 (25), 256602-1-256602-4.
Other URL: http://link.aps.org/abstract/PRL/v87/e256602
We study the spin-dependent magneto conductance in mesoscopic rings subject to an inhomogeneous in- plane magnetic field. We show that the polarization direction of transmitted spin- polarized electrons can be controlled via an additional magnetic flux such that spin flips are induced at half a flux quantum. This quantum interference effect is independent of the strength of the nonuniform field applied. We give an analytical explanation for one-dimensional rings and numerical results for corresponding ballistic microstructures.