Dr. Thilo Stöferle, "Superfluorescence in Lead Halide Perovskite Nanocrystal Assemblies"

Dr. Thilo Stöferle from IBM ResearchZurich presents his work on perovskite nanocrystal superlattices and describes their extraordinary optical superfluorescence properties. Abstract: In recent years, fully inorganic cesium lead halide nanocrystals have emerged as a new, promising class of optoelectronic materials. They exhibit giant oscillator strength and long dephasing time at cryogenic temperature as well as low inhomogeneous energetic broadening, which makes them ideally suited to explore settings that exploit their exceptionally strong intrinsic light-matter coupling. Through drying-mediated self-assembly of the colloidal nanocrystals, we can realize various superlattice geometries where we observe coherent, cooperative emission, so-called superfluorescence. There the quantum dots spontaneously synchronize, thereby forming effectively a giant dipole and emitting an intense burst of light with characteristic signatures that will be discussed for different superlattice assemblies. Bio: Thilo Stöferle received his PhD in physics in 2005 on atomic quantum gases in optical lattices at the ETH Zurich in the quantum optics group of Prof. T. Esslinger, for which he was awarded the Medal of the ETH Zurich and the Dimitris N. Chorafas prize. In 2006, he joined IBM Research – Zurich, working on optoelectronic materials, nanophotonics and photonic integrated circuits with conjugated polymers and colloidal nanocrystals. His current research interests are on perovskite nanocrystals and exciton-polariton condensates for all-optical logic circuits and polariton lattices.