Regensburg 2013 – wissenschaftliches Programm

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HL: Fachverband Halbleiterphysik

HL 29: Poster Session: Spintronics; Spin-controled transport; Topological insulators; Interfaces / Surfaces; Magnetic semiconductors

HL 29.9: Poster

Montag, 11. März 2013, 16:00–20:00, Poster A

Charge and spin dynamics in quantum wells under surface acoustic waves — •Johannes Wanner, Cosimo Gorini, Peter Schwab, and Ulrich Eckern — Institute of Physics, University of Augsburg, 86135 Augsburg, Germany

Various recent experiments have shown the flexibility of surface acoustic waves as a mean for transporting charge and spin in quantum wells [1]. In particular, they 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 surface acoustic wave. A number of experimentally observed features can thus be explained.

[1] J. A. H. Stotz et al., Nat. Mat. 4, 585 (2005); H. Sanada et al., Phys. Rev. Lett. 106, 216602 (2011)

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