Electrical control of the sign of the g-factor in a GaAs hole quantum point contact

Abstract

Zeeman splitting of 1D hole subbands is investigated in quantum point contacts (QPCs) fabricated on a (311) oriented GaAs-AlGaAs heterostructure. Transport measurements can determine the magnitude of the g-factor, but cannot usually determine the sign. Here we use a combination of tilted fields and a unique off-diagonal element in the hole g-tensor to directly detect the sign of g*. We are able to tune not only the magnitude, but also the sign of the g-factor by electrical means, which is of interest for spintronics applications. Furthermore, we show theoretically that the resulting behavior of g* can be explained by the momentum dependence of the spin-orbit interaction.

arXiv comment5 pages, 4 figures

References in corpus (10)

• Quantum Computation with Quantum Dots
• Possible Spin Polarization in a One-Dimensional Electron Gas
• Highly anisotropic g-factor of two-dimensional hole systems
• Zeeman splitting in ballistic hole quantum wires
• Spin Orientation of Holes in Quantum Wells
• Voltage tunability of single spin-states in a quantum dot
• Observation of orientation- and $k$-dependent Zeeman spin-splitting in hole quantum wires on (100)-oriented AlGaAs/GaAs heterostructures
• Characterization of spin-orbit interactions of GaAs heavy holes using a quantum point contact
• Interplay between one-dimensional confinement and crystallographic anisotropy in ballistic hole quantum wires
• Using a tunable quantum wire to measure the large out-of-plane spin splitting of quasi two-dimensional holes in a GaAs nanostructure

Cited by in corpus (13)

• Quantum Transport in Topological Semimetals under Magnetic Fields
• Negative Magnetoresistance without Chiral Anomaly in Topological Insulators
• Electrical control of the $g$-tensor of a single hole in a silicon MOS quantum dot
• Ballistic one-dimensional holes with strong g-factor anisotropy in germanium
• Strong influence of spin-orbit coupling on magnetotransport in two-dimensional hole systems
• Electrical operation of planar Ge hole spin qubits in an in-plane magnetic field
• Quantum Transport in Topological Semimetals under Magnetic Fields (II)
• Detection and control of spin-orbit interactions in a GaAs hole quantum point contact
• Signatures of quantum mechanical Zeeman effect in classical transport due to topological properties of two-dimensional spin-3/2 holes
• Asymmetric $g$ tensor in low-symmetry two-dimensional hole systems
• Tuning the Topological Features of Quantum-Dot Hydrogen and Helium by a Magnetic Field
• Dephasing of planar Ge hole spin qubits due to 1/$\text{f}$ charge noise
• Effect of disorder and strain on the operation of planar Ge hole spin qubits