Electric field control of a quantum dot molecule through optical excitation

摘要

Nonresonant optical excitation of a coupled quantum dot system was seen to generate a shift in the electric-field-dependent photoluminescence spectra. By monitoring the interdot recombination associated with an electron and hole in different dots we were able to precisely monitor the internal electric field generated. Power, wavelength, and applied field dependence of the charging was studied. Such an optically generated electric field may provide a means for applying local oscillating voltages, allowing for optical tuning of the device parameters.