Few-electron Single and Double Quantum Dots in an InAs Two-Dimensional Electron Gas

Abstract

Most proof-of-principle experiments for spin qubits have been performed using GaAs-based quantum dots because of the excellent control they offer over tunneling barriers and the orbital and spin degrees of freedom. Here, we present the first realization of high-quality single and double quantum dots hosted in an InAs two-dimensional electron gas (2DEG), demonstrating accurate control down to the few-electron regime, where we observe a clear Kondo effect and singlet-triplet spin blockade. We measure an electronic $g$-factor of $16$ and a typical magnitude of the random hyperfine fields on the dots of $\sim 0.6\mathrm{mT}$. We estimate the spin-orbit length in the system to be $\sim 5-10\mu \mathrm{m}$, which is almost two orders of magnitude longer than typically measured in InAs nanostructures, achieved by a very symmetric design of the quantum well. These favorable properties put the InAs 2DEG on the map as a compelling host for studying fundamental aspects of spin qubits. Furthermore, having weak spin-orbit coupling in a material with a large Rashba coefficient potentially opens up avenues for engineering structures with spin-orbit coupling that can be controlled locally in space and/or time.

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• Three-carrier spin blockade and coupling in bilayer graphene double quantum dots
• A comprehensive study of out-of-equilibrium Kondo effect and Coulomb blockade
• Atomic collapse of high-order singular potentials in graphene
• High transparency induced superconductivity in field effect two-dimensional electron gases in undoped InAs/AlGaSb surface quantum wells
• Clean quantum point contacts in an InAs quantum well grown on a lattice-mismatched InP substrate
• Gate tuning of fractional quantum Hall states in InAs two-dimensional electron gas