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Séminaire NANO

Mardi 9 Septembre à 9h30,
Salle Rémy Lemaire, K223

Oratrice : Regine Frank, Institute of Theoretical Physics, (Eberhard-Karls University of Tübingen)
"Non-equilibrium AC Stark shift and exciton-polariton lasing in ZnO Mie resonators"

abstract :

Floquet-Keldysh non-equilibrium dynamical mean field calculations (DMFT) with an iterative perturbative solver (IPT) for high pump-power are presented that induce Stark states and a vanishing Mott-Hubbard gap within ZnO bulk and ZnO nano-cavities. Our model predicts unusal broadening of bands in systems like ZnO random lasers. This can be explained as an exciton-polariton coupling within the single ZnO cylinders meeting the optical Mie resonance which consequently leads to strong higher order non-linearities. Extraordinary enhancement of the lifetime of polaritonic states within the gap can lead to stable lasing modes and gain narrowing. The results are compared to recent experiments.

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