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

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 measureme...

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Bibliographic Details
Published in:arXiv.org 2020-12
Main Authors: Mu, Jingwei, Huang, Shaoyun, Ji-Yin, Wang, Huang, Guang-Yao, Wang, Xuming, Xu, H Q
Format: Article
Language:English
Subjects:
Excitation spectra
Indium antimonide
Intermetallic compounds
Level crossings
Magnetic fields
Mathematical analysis
Nanowires
Orthogonality
Quantum confinement
Quantum dots
Spin-orbit interactions
Tensors
Zeeman effect
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Summary: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.
ISSN:2331-8422
DOI:10.48550/arxiv.2009.06731