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The influence of an external uniform electric field on the electron energy structure and charge densities of semiconductor nanocrystals is investigated. We study both uniform and multilayer nanocrystals as well as artificial molecules, i.e. systems built of two coupled quantum dots. We work in the framework of an empirical tight-binding theory, that allows the study of effects not accessible within...
We examine different solutions of multi-band k.p Hamiltonians. We refer mainly to the ''intrinsic surface states'', with energies in the forbidden energy gap, that were proposed recently (Sercel et al. Phys. Rev. Lett. 83 (1999) 2394) for bare and capped nanocrystals. We review analytical and numerical results for different Hamiltonians and demonstrate that spurious solutions occur both for quantum...
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