Stable quantum dots in an InSb two-dimensional electron gas

Abstract

Indium antimonide (InSb) two-dimensional electron gases (2DEGs) have a unique combination of material properties: high electron mobility, strong spin-orbit interaction, large Landé g-factor, and small effective mass. This makes them an attractive platform to explore a variety of mesoscopic phenomena ranging from spintronics to topological superconductivity. However, there exist limited studies of quantum confined systems in these 2DEGs, often attributed to charge instabilities and gate drifts. We overcome this by removing the $\delta$-doping layer from the heterostructure, and induce carriers electrostatically. This allows us to perform the first detailed study of stable gate-defined quantum dots in InSb 2DEGs. We demonstrate two distinct strategies for carrier confinement and study the charge stability of the dots. The small effective mass results in a relatively large single particle spacing, allowing for the observation of an even-odd variation in the addition energy. By tracking the Coulomb oscillations in a parallel magnetic field we determine the ground state spin configuration and show that the large g-factor ($\sim$30) results in a singlet-triplet transition at magnetic fields as low as 0.3 T.

arXiv commentIncludes supplementary information. Data files available at https://doi.org/10.4121/uuid:28a121af-1e08-429d-9d53-1cc53764e91e

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• Review of performance metrics of spin qubits in gated semiconducting nanostructures
• Gate-defined Quantum Point Contact in an InSb Two-dimensional Electron Gas
• A Gate-Defined Quantum Point Contact in an InAs Two-Dimensional Electron Gas
• Electronic g-factor and Magneto-transport in InSb Quantum Wells
• A double quantum dot defined by top gates in a single crystalline InSb nanosheet
• Field effect two-dimensional electron gases in modulation-doped InSb surface quantum wells
• Fabrication and characterization of InSb nanosheet/hBN/graphite heterostructure devices
• Electrically tunable spin-orbit interaction in an InAs nanosheet
• High transparency induced superconductivity in field effect two-dimensional electron gases in undoped InAs/AlGaSb surface quantum wells
• Spin splitting, Kondo correlation and singlet-doublet quantum phase transition in a superconductor-coupled InSb nanosheet quantum dot