Optical Anisotropy of Electronic Excitations in Elliptical Quantum Dots
  The authors report that anisotropic confining potentials in laterally-coupled semiconductor quantum dots (QDs) have large impacts in optical transitions and energies of inter-shell collective electronic excitations. The observed anisotropies are revealed by inelastic light scattering as a function of the in-plane direction of light polarization and can be finely controlled by modifying the geometrical shape of the QDs. These experiments show that the tuning of the QD confinement potential offers a powerful method to manipulate electronic states and far-infrared inter-shell optical transitions in quantum dots. 
Achintya Singha, Vittorio Pellegrini, Sokratis Kalliakos, Biswajit   Karmakar, Aron Pinczuk, Loren N. Pfeiffer, and Ken W. West