Dresden 2014 – wissenschaftliches Programm

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HL: Fachverband Halbleiterphysik

HL 106: Poster: Spintronics (with MA/O)

HL 106.4: Poster

Donnerstag, 3. April 2014, 17:00–20:00, P1

Spin dynamics in quantum wells under surface acoustic waves — •Johannes Wanner1, Cosimo Gorini2, Peter Schwab1, and Ulrich Eckern11Institute of Physics, University of Augsburg, 86135 Augsburg, Germany — 2Service de Physique de l’Etat Condensé, CEA-Saclay, 91191 Gif sur Yvette, France

Various recent experiments have shown the flexibility of surface acoustic waves (SAW) as a mean for transporting charge and spin in quantum wells [1]. In particular, SAW have proven highly effective for the coherent transport of spin-polarized wave packets, suggesting their potential in spintronics applications. Motivated by these experimental observations we have theoretically studied the spin and charge dynamics in a quantum well under surface acoustic waves. Based on previous work by some of us [2], we show that the dynamics acquires a simple and transparent form in a reference frame co-moving with the SAW. The observed values for spin relaxation and precession length can thus be explained.

[1] H. Sanada et. al., Phys. Rev. Lett. 106, 216602 (2011); O. Couto et. al., Phys. Rev. B 78, 153305 (2008)

[2] P. Schwab et al., Phys. Rev. B 74, 155316 (2006)

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