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Many-body interactions of charge carriers in quantum-confined semiconducting nanostructures
are enhanced relative to their bulk counterparts and thus have opened new opportunities for
manipulating and enhancing light-matter interactions. From a fundamental point of view, the
enhanced Coulomb interactions due to the low-dimensional confinement endow carrier–carrier
interactions, predicted to generate exotic effects such as exciton complexes, coherent optical Stark
effect, Mott transition, bandgap renormalization, and condensation of charge carriers. In this talk,
I will be discussing the many-body interactions in the semiconducting solution-processable metal
halide perovskite (MHP) quantum dots (QDs) of the general formula APbX3 (where A=Cs and
X=Cl/Br/I), the unusual coherent optical Stark effect of redshift, Autler-Townes like splitting and
blue shift as a function drive photon frequency in the framework of interacting biexciton picture,
spin selective bandgap renormalization, electron-hole liquid at room temperature and facet
engineering as a new method to reduce the threshold for optical gain. |