Anisotropic g-Factor and Spin-Orbit Field in a Ge Hut Wire Double Quantum Dot

Abstract

Holes in nanowires have drawn significant attention in recent years because of the strong spin-orbit interaction, which plays an important role in constructing Majorana zero modes and manipulating spin-orbit qubits. Here, from the strongly anisotropic leakage current in the spin blockade regime for a double dot, we extract the full g-tensor and find that the spin-orbit field is in plane with an azimuthal angle of 59° to the axis of the nanowire. The direction of the spin-orbit field indicates a strong spin-orbit interaction along the nanowire, which may have originated from the interface inversion asymmetry in Ge hut wires. We also demonstrate two different spin relaxation mechanisms for the holes in the Ge hut wire double dot: spin-flip cotunneling to the leads, and spin-orbit interaction within the double dot. These results help establish feasibility of a Ge-based quantum processor.

23 pages, 5 figures

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• Recent advances in hole-spin qubits
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• Gate-Tunable Spin-Orbit Coupling in a Germanium Hole Double Quantum Dot
• Electrical operation of planar Ge hole spin qubits in an in-plane magnetic field
• All-electrical control of hole singlet-triplet spin qubits at low leakage points
• Effect of induced transition on the quantum entanglement and coherence in two-coupled double quantum dots system
• Electrical operation of hole spin qubits in planar MOS silicon quantum dots
• Low-energy subband wave-functions and effective $g$-factor of one-dimensional hole gas
• Dephasing of planar Ge hole spin qubits due to 1/$\text{f}$ charge noise
• Theory of superconducting proximity effect in hole-based hybrid semiconductor-superconductor devices
• Hole subband dispersions and strong `spin'-orbit coupling in a cylindrical Ge nanowire
• Evolution of surface morphology from Stranski Krastanov growth mode to step flow growth mode in InSbBi thin films
• Direct measurement of spin-flip rates in single-electron tunneling
• Disentangling orbital and confinement contributions to $g$-factor in Ge/SiGe hole quantum dots
• Searching strong `spin'-orbit coupled one-dimensional hole gas in strong magnetic fields
• Spin qubit shuttling between coupled quantum dots with inhomogeneous Landé g-tensors