%0 Journal Article
%T Nonequilibrium dynamics in an optical transition from a neutral quantum dot to a correlated many-body state
%A F. Haupt
%A S. Smolka
%A M. Hanl
%A W. W¨¹ster
%A J. Miguel-Sanchez
%A A. Weichselbaum
%A J. von Delft
%A A. Imamoglu
%J Physics
%D 2013
%I arXiv
%R 10.1103/PhysRevB.88.161304
%X We investigate the effect of many-body interactions on the optical absorption spectrum of a charge-tunable quantum dot coupled to a degenerate electron gas. A constructive Fano interference between an indirect path, associated with an intra dot exciton generation followed by tunneling, and a direct path, associated with the ionization of a valence-band quantum dot electron, ensures the visibility of the ensuing Fermi-edge singularity despite weak absorption strength. We find good agreement between experiment and renormalization group theory, but only when we generalize the Anderson impurity model to include a static hole and a dynamic dot-electron scattering potential. The latter highlights the fact that an optically active dot acts as a tunable quantum impurity, enabling the investigation of a new dynamic regime of Fermi-edge physics.
%U http://arxiv.org/abs/1304.1745v3