Berlin 2008 – wissenschaftliches Programm
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HL: Fachverband Halbleiterphysik
HL 17: Poster I
HL 17.16: Poster
Montag, 25. Februar 2008, 16:30–19:00, Poster D
Crystallization of strongly correlated indirect excitons — •Patrick Ludwig1,2, Alexej Filinov1, Heinrich Stolz2, and Michael Bonitz1 — 1CAU zu Kiel, ITAP, Leibnizstraße 15, D-24098 Kiel — 2Universität Rostock, Institut für Physik, Universitätsplatz 3, D-18051 Rostock
We consider small ensembles of optically excited indirect excitons in a single quantum well. Using Path Integral Monte Carlo we compute from first principles the spatial separation of electrons and holes and the lateral quantum Stark confinement in the quantum well due to a strong electric field from a tip electrode [1]. Electrons and holes are shown to form permanent dipoles with a strong repulsion giving rise to interesting correlation and quantum effects [2,3]. By changing the field strength, tip to sample distance and excitation intensity (exciton number) and temperature we predict the parameter range where exciton crystallization is expected to be observable in experiments on ZnSe based quantum wells.
[1] P. Ludwig et al., phys. stat. sol. (b) 243, No. 10, 2363 (2006)
[2] A. Filinov et al., phys. stat. sol. (c) 3, No. 7, 2457 (2006)
[3] A. Filinov et al., J. Phys: Conf. Series 35, 197 (2006)