Dresden 2017 – wissenschaftliches Programm
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HL: Fachverband Halbleiterphysik
HL 63: Poster: Quantum Dots and Optics
HL 63.52: Poster
Mittwoch, 22. März 2017, 15:00–19:00, P1A
Hole spin mixing due to biaxial strain on GaAs/AlGaAs quantum dots — •Fritz Weyhausen-Brinkmann1 and Gabriel Bester1,2 — 1Universität Hamburg, Grindelallee 117, 20146 Hamburg, Germany — 2The Hamburg Centre for Ultrafast Imaging, Luruper Chaussee 149, 22761 Hamburg, Germany
We calculate the spin-resolved light-hole and heavy-hole (LH-HH) band mixing in GaAs/AlGaAs quantum dots (QDs). The exciton emission spectrum of these QDs show optical anisotropy in their growth plane and the directions of polarization are strongly influenced by the LH-HH mixing. In the field of quantum information and quantum processing QDs are hot candidates, e.g. as single photon sources or quantum repeaters, which requires a good understanding of their optical properties. We are using the atomistic empirical pseudopotential approach including spin-orbit coupling to determine the spin-resolved LH-HH mixing of the single particle wave function as a function of biaxial strain for different types of QDs [1]. We find a heavy-hole spin mixing when LH-HH mixing is strong. The degree of linear polarization (DLP) is related to the heavy-hole weight of the wave function. This allows the determination of the latter by measuring the in-plane polarization, but the results are different in comparison to the model. We also find a universal relation between DLP and the polarization in z-direction for lens shaped QDs.
[1] Y. Huo et al., Nature Physics 10, 46-51 (2014).