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HL: Fachverband Halbleiterphysik

HL 32: Quantum dots and wires: Optical properties II

HL 32.8: Talk

Wednesday, March 14, 2018, 17:00–17:15, A 151

Prospects of Quantum Dot based Quantum Cascade Lasers — •Alexander Mittelstädt and Andrei Schliwa — Technische Universität Berlin, Institut für Festkörperphysik

The examination of the electronic structure of stacked and strongly coupled quantum dots (QDs) serves as groundwork for the development of quantum cascade lasers [1] consisting of quantum dot chains as gain material [2]. We show intradot excited state to ground state transitions in stacks of 14 and 20 InGaAs QDs embedded in a GaAs matrix. Simulations of large scale systems at various biases are accomplished via a ’linear combination of atomic orbitals’ type of approximation based on single quantum dot eight-band k*p-wavefunctions.

[1] J. Faist, F. Capasso, et al. Science, 264(5158):553-556, 1994.

[2] R. A. Suris. In Future Trends in Microelectronics, pp. 197-208. Springer Netherlands, 1996.