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TT: Fachverband Tiefe Temperaturen

TT 39: Transport: Nanoelectronics II - Spintronics and Magnetotransport

TT 39.6: Vortrag

Freitag, 29. Februar 2008, 12:00–12:15, EB 202

Electrically driven spin dynamics in disordered electron systems — •Mathias Duckheim and Daniel Loss — Department of physics, University of Basel, CH-4056 Basel, Switzerland

A key principle of many spintronics applications is the coherent control of spins at the nanometer scale using electric fields. However, with no direct electrical coupling to the spin available, indirect mechanisms are necessary to achieve this task.

In this talk we discuss the possibility of coherent spin control using electric-dipole-induced spin resonance[1-4](EDSR) and the magnetoelectrocal effect[5]. We investigate the spin polarization and the associated spin-Hall current due to EDSR and study the disorder-induced broadening of the resonance due to the D’yakonov-Perel mechanism, which limits the efficiency of EDSR[3] drastically. We show[4] that these limitations can be partially circumvented by exploiting the interference of different spin-orbit interaction mechanisms and give a phenomenological description of the spin dynamics that recovers the diagrammatic linear response calculation for a weak electric field but extends to the non-equilibrium situation of strong driving.

[1] R. L. Bell, Phys. Rev. Lett. 9, 52 (1962).

[2]Y. K. Kato and R. C. Myers and A. C. Gossard and D. D. Awschalom, Nature 427, 50 (2004).

[3] M. Duckheim and D. Loss, Nature Phys. 2, 195 (2006).

[4] M. Duckheim and D. Loss, Phys. Rev. B 75, 201305(R) (2007).

[5] V. M. Edelstein, Solid State Comm. 73, 233 (1990).