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

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

Research output: Contribution to journalArticlepeer-review

11 Citations (Scopus)


Zeeman splitting of one-dimensional hole subbands is investigated in quantum point contacts 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.

Original languageEnglish
Article number041406
JournalPhysical Review B
Issue number4
Publication statusPublished - 2016 Jul 18


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