Méndez Martín, BianchiDomínguez-Adame Acosta, Francisco2023-06-202023-06-201994-080370-197210.1002/pssb.2221840235https://hdl.handle.net/20.500.14352/58967© Wiley-VCH Verlag.We have theoretically investigated two-band models of graded-gap superlattices within the envelope-function approximation. Assuming that the gap varies linearly with spatial coordinate, we are able to find exact solutions of the corresponding Dirac-like equation describing the conduction- and valenceband envelope-functions. The dispersion relation inside allowed miniband of the superlattice may be expressed in terms of confluent hypergeometric functions in a closed form.engjournal articlehttp://dx.doi.org/10.1002/pssb.2221840235http://onlinelibrary.wiley.comhttp://arxiv.org/abs/cond-mat/9407020v1open access538.9PotentialsFísica de materiales