Berlin 2015 – scientific programme
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TT: Fachverband Tiefe Temperaturen
TT 95: Spintronics: Mobile Electrons and Holes (jointly with HL, MA)
TT 95.1: Talk
Thursday, March 19, 2015, 10:00–10:15, ER 164
Conserved Spin Quantity in Strained Hole Systems with Rashba and Dresselhaus Spin-Orbit Coupling — •Michael Kammermeier1, Paul Wenk1, John Schliemann1, Klaus Richter1, and Roland Winkler2 — 1Universität Regensburg, D-93040 Regensburg, Germany — 2Northern Illinois University, IL 60115 DeKalb, US
We investigate conditions for the existence of a conserved spin quantity in two-dimensional hole gases in zincblende type semiconductor heterostructures. It is shown that in the presence of shear stress, a symmetric in-plane strain, and both Rashba and Dresselhaus spin-orbit coupling one can find such a conserved quantity. The found optimal parameter-space, for strain and spin-orbit coupling strength, gives the possibility to an experimental access. This is in contrast to previous works which require restrictions on the band model parameters (here the Luttinger parameters) which are either difficult to realize in real materials or even singular (γ3=0).
[1] Schliemann et al., PRL 90 146801 (2003)
Bernevig et al., PRL 97 236601 (2006)
Kohda et al., PRB 86 081306 (2012)
Dollinger et al. Phys. Rev. B 90, 115306 (2014)