Regensburg 2013 – scientific programme
Parts | Days | Selection | Search | Updates | Downloads | Help
CPP: Fachverband Chemische Physik und Polymerphysik
CPP 12: Poster: Nanoparticles and Composite Materials
CPP 12.12: Poster
Monday, March 11, 2013, 17:30–19:30, Poster C
Ultrafast Spectroscopy of excitonic states in an individual CdSe nanowire — •Thorsten Schumacher1,2, Harald Giessen2, and Markus Lippitz1,2 — 1Max Planck Institute for Solid State Research, Stuttgart — 24th Physics Institute, University of Stuttgart
We investigate the spectrally resolved ultrafast carrier dynamics of excitonic states of a single CdSe nanowire at room temperature. The transient absorption spectra show characteristic short and long living effects that we attribute to a highly excited electron-hole plasma and excitonic state bleaching. We discuss both phenomena and show a very good agreement between the detected bleaching signal and the dipole allowed excitonic transition energies, calculated by a six band-effective mass model. Furthermore we extract the lifetime of various transitions and set them in comparison to the corresponding photoluminescence response. Here we obtain hints on radius fluctuations within a single wire leading to an enhanced probability of spontaneous emission at these large radius defects.