Determination of g-factor in InAs two-dimensional electron system by capacitance spectroscopy

Abstract

We determine the effective g-factor () of a two-dimensional electron gas (2DEG) using a new method based on capacitance spectroscopy. The capacitance-voltage profile of a 2DEG in an InAs/AlGaSb quantum well measured in an in-plane magnetic field shows a double-step feature that indicates the Zeeman splitting of the subband edge. The method allows for simultaneous and independent determination of and effective mass . Data suggests that the biaxial tensile strain in the InAs layer has considerable impact on both and . Our method provides a means to determine that is complementary to the commonly used coincidence technique.