Beschreibung:
AbstractIn the framework of Dimmock's two band model and in the constant band edge approximation within each layer, the electronic structure for the PbTe–Pb1−xSnxTe SL is studied. The study is carried out for the 〈111〉 valley, ϰ⟂ = 0, and taking into account all the possible solutions for the effective Hamiltonian. A new dispersion relation and new zero energy gap conditions are derived. Numerical calculations reveal that the inclusion of the largest wave vector solutions do not substantially modify the energy spectrum obtained when such solutions are excluded.