Dresden 2009 – scientific programme

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HL: Fachverband Halbleiterphysik

HL 48: Poster 2

HL 48.57: Poster

Thursday, March 26, 2009, 15:00–17:30, P2

Theory of Electron Phonon Interaction for Relaxation and Luminescence in Semiconductor Quantum Dots — •Matthias–René Dachner, Janik Wolters, Andreas Knorr, and Marten Richter — Institut für Theoretische Physik, Technische Universität Berlin

Using an effective Hamiltonian approach in which the states of a quantum system are divided into relevant and remote states, we derive equations of motion to describe higher order phonon processes.

As an application we calculate relaxation and dephasing times of electron-hole excitations in self assembled quantum dots where the energetic gaps between wetting layer and discrete states are on the order of several phonon energies.

Additionaly we discuss the influence of pure dephasing through acoustic phonons on the quantum dot luminescence. We stress that the choice of the quantum dot wavefunction is crucial for coupling matrix elements comparing calculated luminescence spectra with spectra from single quantum dot spectroscopy.