Dresden 2003 – wissenschaftliches Programm
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HL: Halbleiterphysik
HL 27: Spinabh
ängiger Transport I
HL 27.4: Vortrag
Dienstag, 25. März 2003, 18:00–18:15, BEY/154
Spin filter effects in mesoscopic ring structures — •Diego Frustaglia1, Markus Popp2, and Klaus Richter3 — 1Institut für Theoretische Festkörperphysik,Universität Karlsruhe, 76135 Karlsruhe — 2Max-Planck-Institut für Quantenoptik, 85748 Garching — 3Institut für Theoretische Physik, Universität Regensburg, 93040 Regensburg
We study the spin-dependent conductance of ballistic mesoscopic
rings in the presence of orientationally inhomogeneous magnetic
fields. For the proposed set up we show that even a small Zeeman
splitting can lead to a spin polarization of the current up to
45%. Making use of the spin-switch effect [1] we propose an
integrated device consisting of two rings connected in series
which, in principle, is able to both create and coherently
control spin-polarized currents at low temperatures [2].
[1] D. Frustaglia, M. Hentschel, and K. Richter,
Phys. Rev. Lett. 87, 256602 (2001).
[2] M. Popp, D. Frustaglia, and K. Richter, to be published in
Nanotechnology.