Berlin 2005 – scientific programme
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HL: Halbleiterphysik
HL 36: Quantenpunkte und -dr
ähte: Optische Eigenschaften III
HL 36.6: Talk
Monday, March 7, 2005, 11:15–11:30, TU P164
Single CdSe nanorods spectroscopy — •Tobias Selle1, Nicolas Le Thomas1, Mikhail Artemyev2, and Ulrike Woggon1 — 1Experimentelle Physik II, Otto-Hahn Strasse 4, 44221 Dortmund, Germany — 2Institute for Physico-Chemical Problems of Belarussian State University, Minsk 220080, Belarus
Colloidal CdSe(ZnS) core-shell nanorods (NR) are one-dimensional (1D) nanostructures emitting highly polarized light and therefore represent attractive nanocrystals for applications in advanced optical technologies as well as for fundamental research.
The polarization dependence of the excitonic emission lines is determined in bath-cryostat micro-photoluminescence experiments of single NRs. Taking into account the 1D symmetry of the emitter the observations are explained by a radius dependent change in the symmetry of the 1D-exciton ground state which transforms from a dark state into bright states below a critical radius of Rcrit≈ 3.7nm.
Furthermore the excitation intensity dependence of the spectral linshape is investigated at low temperature. The effect of the acoustic phonon and the charges in the surrounding will be discussed.