Pump-probe optical response of an asymmetric double quantum dot molecule

• The optical response of an asymmetric double quantum dot molecule is analyzed.
• The system interacts with a weak probe field and a strong pump field.
• Controlled optical absorption, transparency, and gain are found.
• The optical response is controlled by the gate voltage and the pump field.

We study the interaction of an asymmetric double semiconductor quantum dot molecule with a weak probe field and a strong pump field. We show that the optical properties of the system are controlled by a gate voltage and the pump field. For example, we find that the application of the pump field leads to controlled probe absorption, optical transparency, and gain for weak tunneling rates, while for stronger tunneling rates optical gain disappears and absorption spectra with double peaks are formed.

The probe absorption and dispersion spectra of an asymmetric double quantum dot molecule, under a strong pump field, for weak (a) to strong (d) tunneling coupling.Figure optionsDownload as PowerPoint slide