Monday, February 29, 2016

Abstract-Inter-sublevel dynamics in single InAs/GaAs quantum dots induced by strong terahertz excitation

We combine micro-photoluminescence(PL) with terahertz excitation to investigate the response of singleself-assembled InAs/GaAs quantum dots to intense terahertz pulses tuned to the s-to-p transition. Spectra and transients of single photoluminescence lines reveal the dynamics of electrons upon excitation and subsequent relaxation back into the initial state. Under certain circumstances, the terahertz pulse can release trapped charge carriers, which relax into the quantum dot. Furthermore, we demonstrate near-total depletion of the positive trionPL by an intense terahertz pulse.

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