The tool solves the analytical expansions through transfer matrices to compute transmission coefficients. The RTD tool for example solves the similar problem in a single effective mass approach. It would be great if one could switch easily between these two methods and compare the resulting bands.

The improved version should have: 1) a switch that allows selection of the 2 methods 2) an option to enter different effective masses for wells and barriers (in the tight binding approach) 3) an option to enter a lattice constant – only the tight binding approach depends on its numerics on this, the other approach only in the plotting of the bands.