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Lecture Gugliemo Lanzani


20 February 2007 FWN-Building 5116.0116, Nijenborgh 4, 9747 AG, Groningen
Speaker:Prof. Dr. Gugliemo Lanzani
Affiliation:Dipartimento di Fisica, Politecnico di Milano, Italy
Title:Exciton dynamics in carbon nanotube
Date:Tue Feb 20, 2007
Location:FWN-Building 5116.0116
Host:M.A. Loi
Telephone:+31 50 363 4119


Exciton dynamics following photoexcitation is investigated by time resolved spectroscopy with resolution from sub-10 fs to ms. Quantum confinement of excitons in quasi-1D single wall carbon nanotubes leads to very large binding energy, large oscillator strength, band-to-band transition-density suppression, high critical (Mott) density and ultrafast decay. We find that resonance between discrete levels and continuum states provides the efficient scattering mechanism for higher exciton relaxation, also coupled to large energy G-mode phonons, in competition with Auger like non radiative recombination. After initial fast relaxation, trapping leads to long lived photorefractive effects.
Last modified:22 October 2012 2.30 p.m.