Regensburg 2016 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 62: Frontiers of Electronic Structure Theory: Focus on Topology and Transport III

O 62.12: Vortrag

Mittwoch, 9. März 2016, 18:15–18:30, H24

Trions in a carbon nanotube from ab-initio many-body perturbation theory — •Thorsten Deilmann, Matthias Drüppel, and Michael Rohlfing — Institut für Festkörpertheorie, Universität Münster, Germany

Trion states of three correlated particles (e.g. two electrons and one hole) show up in the optical spectra of doped or gated nanostructures, like carbon nanotubes or transition-metal dichalcogenides.
We demonstrate that trions can be described within ab-initio many-body perturbation theory, as a natural extension of the widely used GW method and Bethe-Salpeter equation. This allows for a direct comparison with excitons on equal footing.
We investigate trion states in a semiconducting (8,0) carbon nanotube, and discuss their spectra, composition, and wave functions. Luminescence from the trions is red-shifted by ∼ 135 meV compared to the excitons.