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arXiv · 2311.05693

Electronic g-factor and tunable spin-orbit coupling in a gate-defined InSbAs quantum dot

S. Metti·C. Thomas·M. J. Manfra
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Abstract

We investigate transport properties of stable gate-defined quantum dots formed in an InSb$_{0.87}$As$_{0.13}$ quantum well. High $\textit{g}$-factor and strong spin-orbit-coupling make InSb$_x$As$_{1-x}$ a promising platform for exploration of topological superconductivity and spin-based devices. We extract a nearly isotropic in-plane effective $\textit{g}$-factor by studying the evolution of Coulomb blockade peaks and differential conductance as a function of the magnitude and direction of magnetic field. The in-plane $\textit{g}$-factors, $|g^*_{[1\bar{1}0]}|$ and $|g^*_{[110]}|$, range from 49 - 58. Interestingly, this $\textit{g}$-factor is higher than that found in quantum dots fabricated from pure InSb quantum wells. We demonstrate tunable spin-orbit-coupling by tracking a spin-orbit-coupling mediated avoided level crossing between the ground state and an excited state in magnetic field. By increasing the electron density, we observed an increase in an avoided crossing separation, $\Delta_{SO}$. The maximum energy separation extracted is $\Delta_{SO}$$\sim$100 $\mu$eV.

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S. Metti, C. Thomas, M. J. Manfra. 2023-11-09. Electronic g-factor and tunable spin-orbit coupling in a gate-defined InSbAs quantum dot. https://arxiv.org/abs/2311.05693

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