  Self-assembled InAs quantum dots (QDs) are of great interest as components of
optoelectronic devices that can operate at the quantum limit. The charge
configuration, interdot coupling, and symmetry of complexes containing multiple
QDs can all be tuned with applied electric fields, but the magnitude and angle
of the electric field required to control each of these parameters depends on
the orientation of the QD complex. We present a 4-electrode device compatible
with optical excitation and emission that allows application of electric fields
with arbitrary magnitudes and angles relative to isolated QD complexes. We
demonstrate the electric field tunability of this device with numerical
simulations.
