Impact of electron-phonon scattering on low dimensional nanostructures [Elektronische Ressource] : quantum dynamics in graphene and semiconductor quantum dots / vorgelegt von Frank Milde

Impact of electron-phonon scatteringon low dimensional nanostructuresQuantum dynamics in graphene and semiconductor quantum dots———————————–Vorgelegt von Diplom-PhysikerFrank Mildeaus Berlinvon der Fakultät II – Mathematik und Naturwissenschaftender Technischen Universität Berlinzur Erlangung des akademischen GradesDoktor der Naturwissenschaften— Dr. rer. nat. —Genehmigte DissertationPromotionsausschussVorsitzende : Prof. Dr. rer. nat. Sabine Klapp, TU Berlin1. Gutachter : Prof. Dr. rer. nat. Andreas Knorr, TU Berlin2. : Prof. Dr. rer. nat. Oliver Benson, HU BerlinTag der wissenschaftlichen Aussprache: 01. Oktober 2010Berlin, 2010D 83To KhanhAbstractThe focus of this thesis lies on the theoretical investigation of low dimensional nanostructures. Theyare formed when the charge carriers are spatially confined below their DE BROGLIE wavelength. Ofparticular interest in this thesis is the influence of phonons (quantized lattice vibrations) on the car-rier dynamics of strictly two-dimensional graphene and zero-dimensional semiconductor quantum dots(QDs).Using an equation of motion approach, the relaxation dynamics of photo-excited carriers and thetemporal evolution of the electronic temperature in graphene is calculated. The intermediately strongelectron-phonon coupling combined with the high optical phonon energies of graphene lead to a fastinitial relaxation of the excited electrons into equilibrium.