Multicomponent envelope function problems: The ultimate concept

We present a new, powerful concept for solving the set of coupled equations of a multicomponent envelope function problem which is based on a quadrature method for the integral equations in momentum space. As an application of our method we discuss the dispersion of holes in AlAs/GaAs and Si/Si 1-x Ge x quantum wells which have recently been probed experimentally by using resonant magneto-tunneling spectroscopy

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