| Abstract
| - The charging effects in a CdSe nanotetrapod have been theoretically investigated by using an atomisticpseudopotential method. We showed that the simple quasiparticle equation based on classical electrostaticconsideration can be derived from the many-body GW equation under proper approximations. We found thatthe surface polarization potential can significantly change the electron wave functions, and there is an incompletecancellation for this potential between the single particle energies and the electron−hole Coulomb interaction.Thus, it is necessary to include this potential in the calculation for complex unconvex systems. We alsocalculated the electron addition energies for a tetrapod. Unlike a simple spherical quantum dot, in which theaddition energies are almost a constant, there is a large variation in the calculated addition energies for differentnumbers of electrons in a tetrapod.
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