Magnetic-field-dependent spin properties of divacancy defects in silicon carbide

Fei-Fei Yan; Jun-Feng Wang; Zhen-Xuan He; Qiang Li; Wu-Xi Lin; Ji-Yang Zhou; Jin-Shi Xu; Chuan-Feng Li; Guang-Can Guo

doi:10.1039/d2nr06624f

Magnetic-field-dependent spin properties of divacancy defects in silicon carbide

Nanoscale. 2023 Mar 16;15(11):5300-5304. doi: 10.1039/d2nr06624f.

Authors

Fei-Fei Yan^{1

2}, Jun-Feng Wang^{1

3

2}, Zhen-Xuan He^{1

2}, Qiang Li^{1

2}, Wu-Xi Lin^{1

2}, Ji-Yang Zhou^{1

2}, Jin-Shi Xu^{1

2

4}, Chuan-Feng Li^{1

2

4}, Guang-Can Guo^{1

2

4}

Affiliations

¹ CAS Key Laboratory of Quantum Information, University of Science and Technology of China, Hefei 230026, China. cfli@ustc.edu.cn.
² Synergetic Innovation Center of Quantum Information and Quantum Physics, University of Science and Technology of China, Hefei 230026, China.
³ College of Physics, Sichuan University, Chengdu, Sichuan 610065, China.
⁴ Hefei National Laboratory, University of Science and Technology of China, Hefei 230088, China.

PMID: 36810581
DOI: 10.1039/d2nr06624f

Abstract

In recent years, spin defects in silicon carbide have become promising platforms for quantum sensing, quantum information processing and quantum networks. It has been shown that their spin coherence times can be dramatically extended with an external axial magnetic field. However, little is known about the effect of magnetic-angle-dependent coherence time, which is an essential complement to defect spin properties. Here, we investigate the optically detected magnetic resonance (ODMR) spectra of divacancy spins in silicon carbide with a magnetic field orientation. The ODMR contrast decreases as the off-axis magnetic field strength increases. We then study the coherence times of divacancy spins in two different samples with magnetic field angles, and both of the coherence times decrease with the angle. The experiments pave the way for all-optical magnetic field sensing and quantum information processing.