Laterally Aligned GaAs Quantum Dot Molecules Grown by Droplet Epitaxy
M. Yamagiwa, Takaaki Mano, Takashi Kuroda, Kazuaki Sakoda, G. Kido, N. Koguchi, F. Minami · AIP conference proceedings · 2007
Laterally aligned, unstrained GaAs/AlGaAs quantum dot molecules (QDMs) are created by droplet epitaxy, utilizing the anisotropic surface potentials of the GaAs (100) surface for the migration of Ga adatoms. Single QDM photoluminescence spectra show a doublet structure, for which effective mass approximation calculations (including the size of the QDM) suggest it originates from molecular orbital energy levels in the QDM.