Spin-orbit splitting and effective masses in p-type GaAs two-dimensional hole gases

Abstract

We present magnetotransport measurements performed on two-dimensional hole gases embedded in carbon doped p-type GaAs/AlGaAs heterostructures grown on [001] oriented substrates. A pronounced beating pattern in the Shubnikov-de Haas oscillations proves the presence of strong spin-orbit interaction in the device under study. We estimate the effective masses of spin-orbit split subbands by measuring the temperature dependence of the Shubnikov-de Haas oscillations at different hole densities. While the lighter heavy-hole effective mass is not energy dependent, the heavier heavy-hole effective mass has a prominent energy dependence, indicating a strong spin-orbit induced non parabolicity of the valence band. The measured effective masses show qualitative agreement with self-consistent numerical calculations.

References in corpus (6)

• Aharonov-Bohm oscillations in the presence of strong spin-orbit interactions
• Strong spin-orbit interactions and weak antilocalization in carbon doped p-type GaAs heterostructures
• Counting statistics of hole transfer in a p-type GaAs quantum dot with dense excitation spectrum
• Non-activated transport of strongly interacting two-dimensional holes in GaAs
• Using a tunable quantum wire to measure the large out-of-plane spin splitting of quasi two-dimensional holes in a GaAs nanostructure
• Aharonov-Bohm rings with strong spin-orbit interaction: the role of sample-specific properties

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