Electro-elastic tuning of single particles in individual self-assembled quantum dots

Chris E. Kuklewicz, Ralph N. E. Malein, Pierre M. Petroff, Brian D. Gerardot

Published 2012-04-21, updated 2012-07-21Version 3

We investigate the effect of uniaxial stress on InGaAs quantum dots in a charge tunable device. Using Coulomb blockade and photoluminescence, we observe that significant tuning of single particle energies (~ -0.5 meV/MPa) leads to variable tuning of exciton energies (+18 to -0.9 micro-eV/MPa) under tensile stress. Modest tuning of the permanent dipole, Coulomb interaction and fine-structure splitting energies is also measured. We exploit the variable exciton response to tune multiple quantum dots on the same chip into resonance.