A generalisation of the Dirac-Kronig-Penney model for polyatomic crystals has been developed. The crystal potential is taken as a periodic array of delta -function potentials, with several delta -functions of different strength in each unit cell. The dispersion law of Dirac electrons in such a potential is found in a closed form.
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F. Domínguez‐Adame (1989) studied this question.
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