期刊
PHYSICAL REVIEW B
卷 104, 期 23, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.104.235303
关键词
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资金
- Australian Research Council [DP150100237, DP200100147, FL190100167]
- U.S. Army Research Office [W911NF-17-1-0198]
- Georg H. Endress Foundation
- MEXT
- Gordon Godfrey Bequest Sabbatical grant
- Australian Research Council [DP200100147] Funding Source: Australian Research Council
The study investigates the hole-spin physics of the first hole in a silicon metal-oxide-semiconductor (MOS) quantum dot, revealing variations in the HH-LH splitting induced by nonuniform strain and a mechanism for electric modulation of the hole g tensor using local electric fields. The results demonstrate tuning of the hole g factor by up to 500% and identify a potential sweet spot to suppress spin decoherence caused by electrical noise, paving the way for optimizing spin-based devices through engineering of nonuniform strains.
Single holes confined in semiconductor quantum dots are a promising platform for spin-qubit technology, due to the electrical tunability of the g factor of holes. However, the underlying mechanisms that enable electric spin control remain unclear due to the complexity of hole-spin states. Here, we study the underlying hole-spin physics of the first hole in a silicon planar metal-oxide-semiconductor (MOS) quantum dot. We show that nonuniform electrode-induced strain produces nanometer-scale variations in the heavy-hole-light-hole (HH-LH) splitting. Importantly, we find that this nonuniform strain causes the HH-LH splitting to vary by up to 50% across the active region of the quantum dot. We show that local electric fields can be used to displace the hole relative to the nonuniform strain profile, allowing a mechanism for electric modulation of the hole g tensor. Using this mechanism, we demonstrate tuning of the hole g factor by up to 500%. In addition, we observe a potential sweet spot where dg(110)/dV = 0, offering a configuration to suppress spin decoherence caused by electrical noise. These results open a path towards a technology involving engineering of nonuniform strains to optimize spin-based devices.
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