The emergent linear Rashba spin-orbit coupling offering the fast manipulation of hole-spin qubits in germanium

Abstract

The electric dipole spin resonance (EDSR) combining strong spin-orbit coupling (SOC) and electric-dipole transitions facilitates fast spin control in a scalable way, which is the critical aspect of the rapid progress made recently in germanium (Ge) hole-spin qubits. However, a puzzle is raised because centrosymmetric Ge lacks the Dresselhaus SOC, a key element in the initial proposal of the hole-based EDSR. Here, we demonstrate that the recently uncovered finite k-linear Rashba SOC of 2D holes offers fast hole spin control via EDSR with Rabi frequencies in excellent agreement with experimental results over a wide range of driving fields. We also suggest that the Rabi frequency can reach 500 MHz under a higher gate electric field or multiple GHz in a replacement by [110]oriented wells. These findings bring a deeper understanding for hole-spin qubit manipulation and offer design principles to boost the gate speed.

11 pages, 3 figures

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Cited by in corpus (10)

• Hole spin driving by strain-induced spin-orbit interactions
• Hole spin manipulation in inhomogeneous and non-separable electric fields
• Quantum control of hole spin qubits in double quantum dots
• Linear-in-momentum spin orbit interactions in planar Ge/GeSi heterostructures and spin qubits
• Flying Spin Qubits in Quantum Dot Arrays Driven by Spin-Orbit Interaction
• Electrical manipulation of a hole `spin'-orbit qubit in nanowire quantum dot: the nontrivial magnetic field effects
• Theory of superconducting proximity effect in hole-based hybrid semiconductor-superconductor devices
• Photodriven germanium hole qubit
• Role of anisotropic confining potential and elliptical driving in dynamics of a Ge hole qubit
• The toric code under antiferromagnetic isotropic Heisenberg interactions