Mathematical analysis of the two-band Schrodinger model

A mathematical model for quantum transport in an interband resonant tunneling diode is studied. The wave function of electrons has two components and is a solution of a 2 × 2 matrix Schrodinger equation derived from the k.p theory. The first component represents that part of electrons living in the conduction band while the second part represents the valence band. Transparent boundary conditions are derived and the Schrodinger equation is coupled to the Poisson equation for the electrostatic potential. Using the repulsivity of the electrostatic interaction, an a priori estimate is derived and used to construct a solution of the overall problem.