Dresden 2009 – wissenschaftliches Programm

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HL: Fachverband Halbleiterphysik

HL 13: Optical properties

HL 13.12: Vortrag

Dienstag, 24. März 2009, 12:30–12:45, BEY 118

Determination of the stress evolution in strained semiconductor lamellae — •Matthias Grave, Sven Wildfang, Matthias Klingbeil, Andrea Stemmann, Christian Heyn, Wolfgang Hansen, Detlef Heitmann, and Stefan Mendach — Institut für Angewandte Physik, Universität Hamburg, Jungiusstraße 11, 20355 Hamburg

We investigate the influence of a controlled deformation of thin lamellae containing a quantum well by means of micro-photoluminescence experiments. Our experimental setup allows a reversible in situ deformation. The induction of stress in a lamella leads to significant changes in the obtained emission spectra of the quantum well. The removal of stress leads to a return of the spectra to the initial state. We obtained spatial images of the strain distribution in the lamella by scanning the photoluminescence spot over the sample and monitoring the locally varying energetic position of the quantum well signal. We simulated the influence of external applied stress to a quantum well potential [1] via COMSOL Multiphysics. We compared the results to our experiment and found a good agreement.

We acknowledge financial support by the Deutsche Forschungsgemeinschaft via GrK 1286 and SFB 508.

[1] C. G. Van de Walle, Phys. Rev. B 39, 1871 (1989).