Influence of built-in strain on Hall effect in InGaAs/GaAs quantum well structures with p-type modulation doping

Abstract

Hall-effect data between 4 and 300 K on p-type strained quantum well structures in the InGaAs alloy system show pronounced effects due to the strain-induced splitting of the heavy- and light-hole valence bands. As a function of biaxial compression in the range 0.5–1.4%, the 77 K mobilities increase monotonically by a factor of ∼5, as does a high-temperature activation energy which is found to be nearly equal to the predicted strain splitting.