4.5 Article

Controlling Synthetic Spin-Orbit Coupling in a Silicon Quantum Dot with Magnetic Field

期刊

PHYSICAL REVIEW APPLIED
卷 15, 期 4, 页码 -

出版社

AMER PHYSICAL SOC
DOI: 10.1103/PhysRevApplied.15.044042

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资金

  1. National Key Research and Development Program of China [2016YFA0301700]
  2. National Natural Science Foundation of China [12074368, 12034018, 11625419, 61922074, 62004185, 11904157]
  3. Strategic Priority Research Program of the CAS [XDB24030601]
  4. Anhui initiative in Quantum Information Technologies [AHY080000]
  5. Fundamental Research Fund for the Central Universities [WK2030000027]
  6. Guangdong Provincial Key Laboratory [2019B121203002]
  7. U.S. ARO [W911NF1410346, W911NF1710257]

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This study experimentally demonstrates control of spin-orbit coupling in silicon quantum dots, showing a unique resonance behavior distinguishing it from intrinsic spin-orbit coupling. The research also predicts optimization of the spin qubit's quality factor by rotating the orientation of the in-plane magnetic field.
Tunable synthetic spin-orbit coupling (SSOC) is one of the key challenges in various quantum systems, such as ultracold atomic gases, topological superconductors, and semiconductor quantum dots. Here we experimentally demonstrate controlling the SSOC by investigating the anisotropy of spin-valley resonance in a silicon quantum dot. As we rotate the applied magnetic field in plane, we find a striking nonsinusoidal behavior of resonance amplitude that distinguishes SSOC from the intrinsic spin-orbit coupling (ISOC), and associate this behavior with the previously overlooked in-plane transverse magnetic field gradient. Moreover, by theoretically analyzing the experimentally measured SSOC field, we predict the quality factor of the spin qubit could be optimized if the orientation of the in-plane magnetic field is rotated away from the traditional working point.

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