Abstract
The existence of surface states in band gaps of a nearly free electron band structure is investigated. While in gaps at the Brillouin zone boundary one finds such a state only for positive potential matrix element, there a surface state always exists for band gaps inside the Brillouin zone.
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Abteilung Prof. Dr. K. Molière.
It is a pleasure to acknowledge the kind hospitality of the Cavendish Laboratory, Cambridge, during the year 1968/69, where this work was done. My thanks are due to the Dr. Carl-Duisberg-Stiftung for the award of a Post-Doctoral Scholarship. I am indebted to Dr. V. Heine and Dr. J. B. Pendry for many useful discussions.
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Forstmann, F. On the theory of surface states in nearly free electron systems. Z. Physik 235, 69–74 (1970). https://doi.org/10.1007/BF01399758
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DOI: https://doi.org/10.1007/BF01399758