Characterization of spin-orbit interactions of GaAs heavy holes using a quantum point contact

Abstract

We present transport experiments performed in high quality quantum point contacts embedded in a GaAs two-dimensional hole gas. The strong spin-orbit interaction results in peculiar transport phenomena, including the previously observed anisotropic Zeeman splitting and level-dependent effective g-factors. Here we find additional effects, namely the crossing and the anti-crossing of spin-split levels depending on subband index and magnetic field direction. Our experimental observations are reconciled in an heavy hole effective spin-orbit Hamiltonian where cubic- and quadratic-in-momentum terms appear. The spin-orbit components, being of great importance for quantum computing applications, are characterized in terms of magnitude and spin structure. In the light of our results, we explain the level dependent effective g-factor in an in-plane field. Through a tilted magnetic field analysis, we show that the QPC out-of-plane g-factor saturates around the predicted 7.2 bulk value.

References in corpus (4)

• Electric Dipole Spin Resonance for Heavy Holes in Quantum Dots
• Zeeman splitting in ballistic hole quantum wires
• Exchange energy and generalized polarization in the presence of spin-orbit coupling in two dimensions
• Electronic and spin properties of hole point contacts

Cited by in corpus (8)

• Dimensional reduction of the Luttinger Hamiltonian and g-factors of holes in symmetric two-dimensional semiconductor heterostructures
• Generation and Detection of Spin Currents in Semiconductor Nanostructures with Strong Spin-Orbit Interaction
• Electrical control of the sign of the g-factor in a GaAs hole quantum point contact
• Effect of spin-orbit interactions on the 0.7 anomaly in quantum point contacts
• Magnetic Field Inducing Zeeman Splitting and Anomalous Conductance Reduction of Half-integer Quantized Plateaus in InAs Quantum Wires
• Rashba-coupling modelling for two-dimensional and high-order Rashba Hamiltonian for one-dimensional confined heavy holes
• Landau quantization, Rashba spin-orbit coupling and Zeeman splitting of two-dimensional heavy holes
• Large Zeeman Splitting in Out-of-Plane Magnetic Field in a Double-Layer Quantum Point Contact