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.

5 pages, 4 figures

References in corpus (5)

• Zeeman splitting in ballistic hole quantum wires
• Spin Orientation of Holes in Quantum Wells
• Voltage tunability of single spin-states in a quantum dot
• 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

Cited by in corpus (1)

• Quantum Transport in Topological Semimetals under Magnetic Fields