Interplay of coupling and superradiant emmision in the optical response of a double quantum dot

TL;DR

This paper theoretically investigates how coupling and superradiant emission influence the optical response of double quantum dots, revealing characteristic features in luminescence and absorption spectra even with large energy mismatches.

Contribution

It introduces a detailed theoretical model showing the effects of coupling and collective emission in double quantum dots, highlighting their impact on optical properties.

Findings

Strong coupling effects persist despite large energy mismatches.

Characteristic features appear in time-resolved luminescence.

Distinct absorption spectrum features linked to collective interactions.

Abstract

We study theoretically the optical response of a double quantum dot structure to an ultrafast optical excitation. We show that the interplay of a specific type of coupling between the dots and their collective interaction with the radiative environment leads to very characteristic features in the time-resolved luminescence as well as in the absorption spectrum of the system. For a sufficiently strong coupling, these effects survive even if the transition energy mismatch between the two dots exceeds by far the emission linewidth.