Conduction-band universality in GaAs-based systems
The non-parabolicity of the conduction band is predicted by a Kane four-band calculation to be approximately universal in direct-gap GaAs under varying pressure, and in direct-gap AlxGa1-xAs for various compositions x, when the band dispersion is plotted in natural units of effective Rydbergs and effective lattice constants. The predicted universality is expected to be a better approximation than the Kane approximation itself.