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 39.23: Poster
Dienstag, 17. März 2015, 14:00–20:00, Poster F
Persistent Spin States in Two-Dimensional Hole Gases in Strained Quantum Wells — •Paul Wenk1, Michael Kammermeier1, Klaus Richter1, Roland Winkler2, and John Schliemann1 — 1Institut für Theoretische Physik, Universität Regensburg, D-93040 Regensburg, Germany — 2Department of Physics, Northern Illinois University, IL 60115 DeKalb, US
In 2003 a particular relation between the spin-orbit coupling (SOC) due to bulk inversion asymmetry (Dresselhaus type SOC) and structure inversion asymmetry (Rashba type SOC) in two-dimensional (2D) electron systems has been found which gives rise to a spin-preserving symmetry.[1] Accordingly, we investigate in our present work the conditions for long-living spin-states in 2D hole gases in zincblende type semiconductor heterostructures. Extending our previous results on the persistent spin helix[5] by including, in addition to both Rashba and Dresselhaus SOC, a shear stress and a symmetric in-plane strain allows for the identification of new persistent spin states. The latter are in contrast to previous results[4,5] which require restrictions on the band model parameters (here the Luttinger parameters) which are difficult to realize in real materials.
[1] Schliemann et al., PRL 90 146801 (2003)
Bernevig et al., PRL 97 236601 (2006)
Kohda et al., PRB 86 081306 (2012)
Sacksteder et al. PRB 89, 161307(R) (2014)
Dollinger et al. PRB 90, 115306 (2014)