Berlin 2015 – wissenschaftliches Programm
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HL: Fachverband Halbleiterphysik
HL 39: Posters II (Topological insulators; Graphene; Spintronics and spin physics; Quantum information science)
HL 39.25: Poster
Dienstag, 17. März 2015, 14:00–20:00, Poster F
Effect of Surface Acoustic Wave Induced Strain on Spin Dynamics — •Johannes Wanner1, Ulrich Eckern1, and Cosimo Gorini2 — 1Institute of Physics, University of Augsburg, 86135 Augsburg, Germany — 2Faculty of Physics, University of Regensburg, 93040 Regensburg, Germany
Surface acoustic waves (SAW) have proven to be useful for driving charge and spin in quantum wells. By effectively separating spatially electrons and holes, spin transport by a SAW eludes the Bir-Aronov-Pikus relaxation mechanism. The piezo-electric in-plane field of the SAW allows to concentrate carriers in narrow pockets [1]. The suppression of the Dyakonov-Perel’ spin relaxation mechanism based on the dominating spin-orbit interactions (Dresselhaus and Rashba) can thus be explained [2]. In this work, we study additional relaxation mechanisms, namely spin-orbit interaction due to strain and an out-of-plane electric field.
[1] H. Sanada et al., Phys. Rev. Lett. 106, 216602 (2011); O. Couto et al., Phys. Rev. B 78, 153305 (2008)
[2] J. Wanner et al., Adv. Mater. Interfaces 1, 1400181 (2014)