Author(s): Liu, Y (Liu, Yang); Xiong, JX (Xiong, Jia-Xin); Wang, Z (Wang, Zhi); Ma, WL (Ma, Wen-Long); Guan, S (Guan, Shan); Luo, JW (Luo, Jun-Wei); Li, SS (Li, Shu-Shen)

Source: PHYSICAL REVIEW B Volume: 105 Issue: 7 Article Number: 075313 DOI: 10.1103/PhysRevB.105.075313 Published: FEB 28 2022

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 quantum wells. These findings bring a deeper understanding for hole-spin qubit manipulation and offer design principles to boost the gate speed.

Accession Number: WOS:000766642500001

ISSN: 2469-9950

eISSN: 2469-9969

Full Text: https://journals.aps.org/prb/abstract/10.1103/PhysRevB.105.075313