Regensburg 2007 – wissenschaftliches Programm

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HL: Fachverband Halbleiterphysik

HL 12: Quantum dots and wires: Optical properties I

HL 12.12: Vortrag

Montag, 26. März 2007, 17:45–18:00, H17

Phonons in semiconductor nanostructures — •Andreas Knittel and Frank Grosse — Institut für Physik der Humboldt-Universität zu Berlin, Newtonstr. 15, 12489 Berlin, Germany

Phonons in semiconductor nanostructures like quantum dots affect the dephasing of optical excitations decisively. In our presented work, the inhomogeneous, atomistic nature of the problem is simulated by employing a valence-force field description. The parameters are taken either directly from experiment or are calculated by density functional theory. The investigated structures include quantum dots of different shapes and alloy compositions. They consist of compounds with either zincblende or wurtzite crystal structure, therefore capturing the equilibrium structures of III-V and group III-nitrides. The phonon density of states is determined by calculating the velocity correlation function in a molecular dynamics simulation. We present also a comparison to continuum elasticity solutions of the wave equation for acoustical phonons.