Berlin 2015 – wissenschaftliches Programm

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HL: Fachverband Halbleiterphysik

HL 9: Quantum dots: Optical properties

HL 9.10: Vortrag

Montag, 16. März 2015, 12:30–12:45, EW 203

Electron-Phonon coupling in colloidal CdSe/CdS quantum dots — •Steffen Westerkamp, Axel Hoffmann, and Andrei Schliwa — Institut für Festkörperphysik, TU Berlin

The Huang-Rhys-factors of electron-phonon coupling in colloidal CdSe/CdS quantum dots are calculated for various sizes, core-shell ratios, and interface transitions both for the zincblende and the wurtzite phase. Electron and hole wavefunctions are obtained using strain dependent 8-band-kp theory. Phonon eigenmodes and frequencies are calculated using an atomistic model employing pseudopotentials. In particular we discuss the consequences of the lower symmetry of the wurtzite phase compared to zincblende with respect to the electronic spectrum, the phonon frequencies and the coupling strength.