  The transport properties of a metal core/semiconductor shell quantum dot
molecule (QDM) embedded in a matrix connected to metallic electrodes are
theoretically studied in the framework of Keldysh Green function technique. The
effects of the electron plasmon interactions (EPIs) on the tunneling current
spectra of QDM are examined. The energy levels of the QDs, intradot and
interdot Coulomb interactions, electron interdot hopping strengths, and
tunneling rates of QDs are renormalized by the EPIs. The differential
conductance spectra show peaks arising from the plasmon assisted tunneling
process, intradot and interdot Coulomb interactions, and coherent tunneling
between the QDs.
