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arXiv · 1702.08135

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

A. Srinivasan·K. L. Hudson·D. S. Miserev·L. A. Yeoh·O. Klochan·K. Muraki·Y. Hirayama·O. P. Sushkov·A. R. Hamilton
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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.

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A. Srinivasan, K. L. Hudson, D. S. Miserev, L. A. Yeoh, O. Klochan, K. Muraki, Y. Hirayama, O. P. Sushkov, A. R. Hamilton. 2017-02-27. Electrical control of the sign of the g-factor in a GaAs hole quantum point contact. https://doi.org/10.1103/physrevb.94.041406

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