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arXiv · 2009.06731

Measurements of anisotropic g-factors for electrons in InSb nanowire quantum dots

Jingwei Mu·Shaoyun Huang·Ji-Yin Wang·Guang-Yao Huang·Xuming Wang·H. Q. Xu
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Abstract

We have measured the Zeeman splitting of quantum levels in few-electron quantum dots (QDs) formed in narrow bandgap InSb nanowires via the Schottky barriers at the contacts under application of different spatially orientated magnetic fields. The effective g-factor tensor extracted from the measurements is strongly anisotropic and level-dependent, which can be attributed to the presence of strong spin-orbit interaction (SOI) and asymmetric quantum confinement potentials in the QDs. We have demonstrated a successful determination of the principal values and the principal axis orientations of the g-factor tensors in an InSb nanowire QD by the measurements under rotations of a magnetic field in the three orthogonal planes. We also examine the magnetic-field evolution of the excitation spectra in an InSb nanowire QD and extract a SOI strength of $\Delta_{so}\sim 180$ $\mu$eV from an avoided level crossing between a ground state and its neighboring first excited state in the QD.

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Jingwei Mu, Shaoyun Huang, Ji-Yin Wang, Guang-Yao Huang, Xuming Wang, H. Q. Xu. 2020-09-14. Measurements of anisotropic g-factors for electrons in InSb nanowire quantum dots. https://doi.org/10.1088/1361-6528%2Fabbc24

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