Journal
PHYSICAL REVIEW B
Volume 105, Issue 7, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.105.075313
Keywords
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Funding
- National Science Fund for Distinguished Young Scholars [11925407]
- Basic Science Center Program of the National Natural Science Foundation of China (NSFC) [61888102]
- Key Research Program of Frontier Sciences, CAS [ZDBS-LY-JSC019]
- CAS Project for Young Scientists in Basic Research [YSBR-026]
- NSFC [11904359]
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Fast spin control in germanium hole-spin qubits is achieved through electric dipole spin resonance (EDSR) by utilizing the finite k-linear Rashba SOC of 2D holes, which compensates for the lack of Dresselhaus SOC in centrosymmetric germanium materials.
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 quantum wells. These findings bring a deeper understanding for hole-spin qubit manipulation and offer design principles to boost the gate speed.
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