Emergent linear Rashba spin-orbit coupling offers fast manipulation of hole-spin qubits in germanium
Emergent linear Rashba spin-orbit coupling offers fast manipulation of hole-spin qubits in germanium
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新兴线性 Rashba 自旋轨道耦合可快速操纵锗中的空穴自旋量子位
DOI：
10.1103/physrevb.105.075313
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发表时间：
2022-02-28
影响因子：
3.7
通讯作者：
Li, Shu-Shen
中科院分区：
文献类型：
--
作者：
Liu, Yang;Xiong, Jia-Xin;Li, Shu-Shen
电偶极自旋共振（EDSR）结合了强自旋轨道耦合（SOC）和电偶极跃迁，以可扩展的方式实现了快速自旋控制，这是锗（Ge）空穴自旋量子比特近年来取得快速进展的关键方面。然而，一个难题是提出，因为中心对称的Ge缺乏Dresselhaus SOC，一个关键因素，在最初的建议，基于孔的EDSR。在这里，我们证明了最近发现的有限k-线性Rashba SOC的2D孔提供快速的孔自旋控制通过EDSR与拉比频率在很宽的范围内的驱动场与实验结果非常一致。我们还提出，在较高的栅电场下，拉比频率可以达到500 MHz，或者用[110]取向的量子威尔斯阱代替，可以达到几GHz.这些发现为空穴自旋量子比特操纵带来了更深入的理解，并提供了提高门速度的设计原则。
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.