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TT: Fachverband Tiefe Temperaturen
TT 23: Nanoelectronics II - Spintronics and Magnetotransport
TT 23.8: Talk
Thursday, March 29, 2007, 11:30–11:45, H19
Zeeman ratchets: rectification of spin currents via magnetic fields — •Matthias Scheid1, Dario Bercioux1,2, and Klaus Richter1 — 1Institut für theoretische Physik, Unversität Regensburg, Germany — 2Physikalisches Institut, Albert-Ludwigs-Universistät, Freiburg, Germany
We propose devices creating directed spin-polarized currents in a two-dimensional electron gas (2DEG) subject to a spatially varying magnetic field [1] and an external adiabatic driving. We consider ballistic, coherent transport through quantum confined systems, where the spatially dependent Zeeman term in the Hamiltonian gives rise to spin polarized currents inside the 2DEG. We explore several setups of these spin ratchets [2], which give rise to nonzero averaged net spin currents in the absence of net charge transport.
[1] A. Matulis, F. M. Peeters, and P. Vasilopoulos, Phys. Rev. Lett. 72, 1518 (1994).
[2] M. Scheid, M. Wimmer, D. Bercioux, and K. Richter, phys. stat. sol. (c), in print (2006), cond-mat/0607380.