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HL: Fachverband Halbleiterphysik
HL 71: Quantum Dots and Wires: Optical Properties
HL 71.4: Vortrag
Donnerstag, 10. März 2016, 10:15–10:30, H15
Consequences of light-hole and heavy-hole mixing on the optical properties of III-V-semiconductor quantum dots — •Fritz Weyhausen-Brinkmann1, Ranber Singh1,2, 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 III-V-semiconductor 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 strain for different types of QDs [1]. We find that the parallel spin of the light-hole is not negligible in contradiction to earlier model [2] and highlight the consequences of this finding on the polarization anisotropy.
[1] Y. Huo et al. Nature Physics 10, 46-51 (2014).
[2] C. Tonin, R. Hostein, V. Voliotis, R. Grousson, A. Lemaitre, and A. Martinez, Phys. Rev. B 85, 155303 (2012).