  Dilute arrays of GaAs/AlGaAs modulation-doped quantum dots (QDs) fabricated
by electron-beam lithography and low impact reactive-ion etching exhibit highly
homogeneous luminescence. Single quantum dots display spectral emission with
peak energies and linewidths linked largely to the geometrical diameter of the
dot and to the built-in electron population. Excitonic-like and
biexcitonic-like emission intensities have activation energy of about 2 meV.
These results highlight the potential of high quality nanofabricated QDs for
applications in areas that require fine control of optical emission.

Other Condensed Matter