Regensburg 2010 – wissenschaftliches Programm
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HL: Fachverband Halbleiterphysik
HL 19: Spin-controlled Transport I
HL 19.5: Vortrag
Dienstag, 23. März 2010, 10:30–10:45, H14
Nonlinear transport effects in ferromagnetic multiple quantum well structures — •Christian Ertler1,2 and Jaroslav Fabian1 — 1Institut für Theoretische Physik, Universität Regensburg, Universitätsstrasse 31, 93040 Regensburg, Germany — 2Institut für Theoretische Physik, Karl-Franzens Universität Graz, Universitätsplatz 5, 8010 Graz, Austria
Heterostructures made of both magnetic and nonmagnetic semiconductors provide rich opportunities for controlling and tuning their spin-dependent transport properties [1]. In the case that the ferromagnetic order in the quantum wells (e.g., made of GaMnAs) is mediated by the itinerant carriers, the resonant tunneling transport and the magnetic properties become strongly interconnected [2]. Here, we show that in coupled multiple quantum well structures this can lead to interesting dynamical effects, such as self-sustained current oscillations or moving magnetoelectric domain walls. The requirements for the occurrence of these effects and for their possible experimental observation are discussed. This work has been supported by the DFG, SFB 689.
[1] J. Fabian, A. Matos-Abiague, C. Ertler, P. Stano and I. Zutic, Acta Phys. Slov. 57, 565 (2007).
[2] C. Ertler and J. Fabian, Phys. Rev. Lett. 101, 077202 (2008).