Electronic structure and optical properties of coupled quantum dots

We calculate the electronic structure of quantum dots coupled along the growth direction with one or two electrons in magnetic fields. We examine the spin transitions of the ground states and the optical transitions between the energy levels, which are associated with far-infrared absorption. Because of the dot-dot and electron-electron interactions, the coupled quantum dots exhibit rich electronic structures. We suggest that the effects of these interactions on the energy spectra are observable by optical measurements because the transition energies exhibit discontinuous changes for a vertically polarized light as the magnetic field increases.