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TT: Fachverband Tiefe Temperaturen

TT 23: Nanoelectronics II - Spintronics and Magnetotransport

TT 23.8: Vortrag

Donnerstag, 29. März 2007, 11:30–11:45, H19

Zeeman ratchets: rectification of spin currents via magnetic fields — •Matthias Scheid¹, Dario Bercioux^1,2, 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.