Berlin 2012 – wissenschaftliches Programm

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HL: Fachverband Halbleiterphysik

HL 26: Poster Session: Heterostructures - Preparation and Characterization - Impurities / Amorphous Semiconductors

HL 26.3: Poster

Montag, 26. März 2012, 16:00–19:00, Poster D

Laser-induced lattice distortions in III-V and II-VI quantum heterostructures — •Sebastian Tiemeyer¹, Michael Bombeck², Michael Paulus¹, Christian Sternemann¹, Florian J. Wirkert¹, Johannes Möller¹, Julia Nase¹, Oliver H. Seeck³, Manfred Bayer², and Metin Tolan¹ — ¹Fakultät Physik / DELTA, TU Dortmund, D-44221 Dortmund, Germany — ²Experimentelle Physik II, TU Dortmund, D-44221 Dortmund, Germany — ³HASYLAB, DESY, D-22607 Hamburg, Germany

Optically excited low dimensional semiconductor heterostructures have shown strong evidence for lattice distortions triggered by exciton-phonon interactions. This effect was observed for the III-V group systems InAs/GaAs and InN/GaN by means of high resolution continuous wave or non-linear time-resolved optical spectroscopy. A local change in the lattice constant due to the creation of electron-hole pairs was as well monitored for II-VI quantum structures.

We have investigated the laser-induced lattice distortions in InAs/GaAs quantum dots and CdSe/CdS core/shell quantum rods by means of anomalous x-ray single crystal diffraction and x-ray powder diffraction, respectively. The presented data were collected at the beamlines BL9 (DELTA, TU Dortmund) and P08 (HASYLAB, DESY Hamburg).