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

Abstract

We determine the effective $g$-factor ($|g^{\ast }|$) 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 $|g^{\ast }|$ and effective mass $m^{\ast }$. Data suggest that the biaxial tensile strain in the InAs layer has considerable impacts on both $m^{\ast }$ and $g^{\ast }$. Our method provides a means to determine $|g^{\ast }|$ that is complementary to the commonly used coincidence technique.

5 pages, 5 figures

References in corpus (3)

• Interaction phenomena in graphene seen through quantum capacitance
• Spin susceptibility and effective mass of two-dimensional electrons in MgxZn1-xO/ZnO heterostructures
• Direct measurements of the fractional quantum Hall effect gaps