Nonequilibrium dynamics in an optical transition from a neutral quantum dot to a correlated many-body state

Abstract

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.

14 pages, 10 figures

References in corpus (3)

• Sum-rule Conserving Spectral Functions from the Numerical Renormalization Group
• Tensor networks and the numerical renormalization group
• Fermi Edge Singularities in Transport through Quantum Dots

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