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In a quantum dot with dozens of electrons, an approximation beyondTamm-Dankoff is used to construct the quantum states with an additionalelectron-hole pair, i.e. the "excitonic" states. The lowest states mimic thenon-interacting spectrum, but with excitation gaps renormalized by Coulombinteractions. At higher excitation energies, the computed density of energylevels shows an exponential increase with energy. In the interband absorption,we found a background level in the quasicontinuum of states rising linearlywith the excitation energy. Above this background, there are distinct peaksrelated to single resonances or to groups of many states with small interbanddipole moments.

Excitonic States in Medium-Size Quantum Dots