Physics – Condensed Matter – Mesoscale and Nanoscale Physics
Scientific paper
2004-02-05
Phys. Rev. B 69, 155327 (2004).
Physics
Condensed Matter
Mesoscale and Nanoscale Physics
29 pages, 15 figures. Second part of a series of two articles
Scientific paper
10.1103/PhysRevB.69.155327
We study spin effects in the magneto-conductance of ballistic mesoscopic systems subject to inhomogeneous magnetic fields. We present a numerical approach to the spin-dependent Landauer conductance which generalizes recursive Green function techniques to the case with spin. Based on this method we address spin-flip effects in quantum transport of spin-polarized and -unpolarized electrons through quantum wires and various two-dimensional Aharonov-Bohm geometries. In particular, we investigate the range of validity of a spin switch mechanism recently found which allows for controlling spins indirectly via Aharonov-Bohm fluxes. Our numerical results are compared to a transfer-matrix model for one-dimensional ring structures presented in the first paper (Hentschel et al., submitted to Phys. Rev. B) of this series.
Frustaglia Diego
Hentschel Martina
Richter Klaus
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