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HL: Fachverband Halbleiterphysik

HL 71: Quantum Dots and Wires: Optical Properties

HL 71.5: Vortrag

Donnerstag, 10. März 2016, 10:30–10:45, H15

Polarization anisotropy of the emission from type-II quantum dots — •Petr Klenovsky^1,2, Dusan Hemzal^1,2, Petr Steindl^1,2, Marketa Zikova³, Vlastimil Krapek⁴, and Josef Humlicek^1,2 — ¹Central European Institute of Technology, Masaryk University, Kamenice 753/5, 62500 Brno, Czech Republic — ²Department of Condensed Matter Physics, Faculty of Science, Masaryk University, Kotlářská 2, 61137 Brno, Czech Republic — ³Institute of Physics CAS, Cukrovarnická 10, Praha 6, 162 00, Czech Republic — ⁴Central European Institute of Technology, Brno University of Technology, Technická 10, 61600 Brno, Czech Republic

We study the polarization response of the emission from type-II GaAsSb capped InAs quantum dots. We theoretically predict the polarization anisotropy of the emission from this system, experimentally verify it by polarization resolved photoluminescence measurements on samples with the type-II confinement, and show that the polarization anisotropy might be utilized to find the vertical position of the hole wavefunction, solving thus the long standing problem of this system. A proposition for usage in the information technology as a room temperature photonic gate operating at the communication wavelengths as well as a simple model to estimate the energy of fine-structure splitting for type-II GaAsSb capped InAs QDs are given.