The effective band gap and the thermally excited carrier concentrations of doping superlattices in PbTe are calculated self-consistently using a semiclassical description. They show interesting temperature behaviors which arise from the temperature dependences of the lattice polarizability, of the bulk band gap, and of the equilibrium carrier concentration. The configurations of lattice polarization which are possible for doping superlattices in PbTe and in Pb1-xGexTe alloys are discussed based on a Landau free energy approach.
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Acknowledgement - This work was supported tially by an ONR contract.