Strong spin-orbit interaction and $g$-factor renormalization of hole spins in Ge/Si nanowire quantum dots

Abstract

The spin-orbit interaction lies at the heart of quantum computation with spin qubits, research on topologically non-trivial states, and various applications in spintronics. Hole spins in Ge/Si core/shell nanowires experience a spin-orbit interaction that has been predicted to be both strong and electrically tunable, making them a particularly promising platform for research in these fields. We experimentally determine the strength of spin-orbit interaction of hole spins confined to a double quantum dot in a Ge/Si nanowire by measuring spin-mixing transitions inside a regime of spin-blockaded transport. We find a remarkably short spin-orbit length of $\sim$65 nm, comparable to the quantum dot length and the interdot distance. We additionally observe a large orbital effect of the applied magnetic field on the hole states, resulting in a large magnetic field dependence of the spin-mixing transition energies. Strikingly, together with these orbital effects, the strong spin-orbit interaction causes a significant enhancement of the $g$-factor with magnetic field.The large spin-orbit interaction strength demonstrated is consistent with the predicted direct Rashba spin-orbit interaction in this material system and is expected to enable ultrafast Rabi oscillations of spin qubits and efficient qubit-qubit interactions, as well as provide a platform suitable for studying Majorana zero modes.

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Cited by in corpus (58)

• Hole spin qubits in Si FinFETs with fully tunable spin-orbit coupling and sweet spots for charge noise
• Squeezed hole spin qubits in Ge quantum dots with ultrafast gates at low power
• Recent advances in hole-spin qubits
• Fully tunable longitudinal spin-photon interactions in Si and Ge quantum dots
• Lightly-strained germanium quantum wells with hole mobility exceeding one million
• Hole Spin Qubits in Ge Nanowire Quantum Dots: Interplay of Orbital Magnetic Field, Strain, and Growth Direction
• Two-qubit logic with anisotropic exchange in a fin field-effect transistor
• Quantum control of hole spin qubits in double quantum dots
• Electrical operation of planar Ge hole spin qubits in an in-plane magnetic field
• Quantum computing on magnetic racetracks with flying domain wall qubits
• All-electrical control of hole singlet-triplet spin qubits at low leakage points
• A singlet-triplet hole-spin qubit in MOS silicon
• Hole spin qubits in thin curved quantum wells
• High-fidelity two-qubit gates of hybrid superconducting-semiconducting singlet-triplet qubits
• Coupled superconducting spin qubits with spin-orbit interaction
• Charge-noise induced dephasing in silicon hole-spin qubits
• Enhanced orbital magnetic field effects in Ge hole nanowires
• High-fidelity spin qubit shuttling via large spin-orbit interaction
• Phase driving hole spin qubits
• Majorana zero modes in gate-defined germanium hole nanowires
• Classification and magic magnetic-field directions for spin-orbit-coupled double quantum dots
• Electrical control of the hole spin qubit in Si and Ge nanowire quantum dots
• Determination of spin-orbit interaction in semiconductor nanostructures via non-linear transport
• Electrical operation of hole spin qubits in planar MOS silicon quantum dots
• Anisotropic $g$-tensors in hole quantum dots: The role of the transverse confinement direction
• Cryogenic hyperabrupt strontium titanate varactors for sensitive reflectometry of quantum dots
• Microscopic analysis of proximity-induced superconductivity and metallization effects in superconductor-germanium hole nanowires
• Cross-architecture Tuning of Silicon and SiGe-based Quantum Devices Using Machine Learning
• Identifying Pauli spin blockade using deep learning
• Non-linear anomalous Hall effect of two-dimensional spin-3/2 heavy holes
• Fully autonomous tuning of a spin qubit
• Charge-sensing of a Ge/Si core/shell nanowire double quantum dot using a high-impedance superconducting resonator
• Line Shapes of Electric Dipole Spin Resonance in Pauli Spin Blockade
• Low-energy subband wave-functions and effective $g$-factor of one-dimensional hole gas
• Clock model and parafermions in Rashba nanowires
• Dephasing of planar Ge hole spin qubits due to 1/$\text{f}$ charge noise
• Modelling of planar germanium hole qubits in electric and magnetic fields
• Pauli spin blockade with site-dependent g-tensors and spin-polarized leads
• InP/GaSb core-shell nanowires: a novel hole-based platform with strong spin-orbit coupling for full-shell hybrid devices
• Probing details of spin--orbit coupling through Pauli spin blockade
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• Enhancement of the Kondo effect in a quantum dot formed in a full-shell nanowire
• Electrical manipulation of a hole `spin'-orbit qubit in nanowire quantum dot: the nontrivial magnetic field effects
• Two-band description of the strong `spin'-orbit coupled one-dimensional hole gas in a cylindrical Ge nanowire
• Quantification of the heavy-hole--light-hole mixing in two-dimensional hole gases
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• Polarimetry With Spins in the Solid State
• Multi-qubit DC gates over an inhomogeneous array of quantum dots
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• Quadrupolar photovoltaic effect in the terahertz range in a two-dimensional spin-3/2 hole system
• Hole subband dispersions and strong `spin'-orbit coupling in a cylindrical Ge nanowire
• Role of anisotropic confining potential and elliptical driving in dynamics of a Ge hole qubit
• Dressed basis sets for the modeling of exchange interactions in double quantum dots
• Acoustic phonons, spin-phonon coupling and spin relaxation via the lattice reorientation mechanism in hexagonal germanium nanowires
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• Anomalous zero-field splitting for hole spin qubits in Si and Ge quantum dots
• Searching strong `spin'-orbit coupled one-dimensional hole gas in strong magnetic fields
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