Abstract
AbstractThe surface Green function for a two‐interface system, obtained by the factorization method, is used to study the virtual surface states, which arise when a linear field is applied to a semiconductor thin film. The energies of the surface states are evaluated as a function of the film thickness. The surface density‐of‐states calculation gives a means of distinguishing the surface states according to the surface on which they are localised. It is also shown that the interaction between the states restricts their existence to certain regions of the energy gap.
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