SKM 2021 – wissenschaftliches Programm
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SYCS: Symposium Multidimensional coherent spectroscopy of functional nanostructures
SYCS 1: Symposium: Multidimensional coherent spectroscopy of functional nanostructures
SYCS 1.1: Hauptvortrag
Dienstag, 28. September 2021, 10:00–10:30, Audimax 1
Multidimensional coherent spectroscopy of perovskite nanocrystals — •Steven Cundiff1, Albert Liu1, Diogo Almeida1,2, Gabriel Nagamine2, and Lazaro Padilha2 — 1University of Michigan, Ann Arbor, MI, USA — 2University of Campinas, Campinas, SP, Brazil
Perovskite nanocrystals, including nanocubes and nanoplatelets, have attracted signficant attention recently due to their novel optoelectronic properties, in particular their high fluorescence quantum efficiency. However there are still debates about their properties, including electronic structure and optical linewidths. Measurements of these properties are hindered by the inhomogeneous broadening due to size dispersion.
We use optical multidimensional coherent spectroscopy at low temperatures to remove the effects of inhomogeneous broadening and elucidate the intrinsic properties of the nanocrystals. This include insight into the ordering of the bandedge states, dephasing rates of triple coherences and dependence of the dephasing excitonic dephasing on the number of layers in nanoplatelets.