Regensburg 2013 – wissenschaftliches Programm

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HL: Fachverband Halbleiterphysik

HL 90: Poster Session: Quantum information systems; Optical properties; Ultrafast phenomena

HL 90.8: Poster

Donnerstag, 14. März 2013, 16:00–20:00, Poster A

Imaging interferometry of excitons in two-dimensional structures — •Heinrich Stolz, Maria Kaupsch, Dirk Semkat, and Günter Manzke — Institut für Physik, Universität Rostock, 18051 Rostock

Recently, spontaneous coherence of excitons in two-dimensional systems has been claimed from measurements of interference contrast using different setups like double slit, shift and mirror interferometers [1,2]. Using the theory of imaging with partial coherent light, we derive general expressions for these setups. We show that in all cases the interference patterns depend not only on the point spread function of the imaging setup but also strongly on the spatial emission pattern of the sample. Taking the experimentally observed emission patterns into account, we can reproduce at least qualitatively all the observed interference structures, which have been interpreted as signatures for spontaneous long range coherence of excitons, already for incoherent emitters. This requires a critical reexamination of the previous work. [1] High A. A.; Leonard J. R.; Remeika M.; Butov L. V.; Hanson M.; Gossard A. C. Nano Lett. 12, 2605 (2012). [2] High A. A.; Leonard J. R.; Butov L. V.; Gossard A. C. Nature 483, 584 (2012). [3] Semkat, D.; Sobkowiak, S.; Manzke, G.; Stolz, H. Nano Lett. 12, 5055 (2012).