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  • Letter

High-precision measurements and first-principles explanation of the temperature-dependent C13 and N14 hyperfine interactions of single NV− centers in diamond at room temperature

Shaoyi Xu1,2,*, Mingzhe Liu1,2,*, Tianyu Xie1,2,†, Zhiyuan Zhao1,2, Qian Shi1,2, Pei Yu1,2, Chang-Kui Duan1,2,3,‡, Fazhan Shi1,2,3,4, and Jiangfeng Du1,2,3,§

  • 1CAS Key Laboratory of Microscale Magnetic Resonance and School of Physical Sciences, University of Science and Technology of China, Hefei 230026, China
  • 2CAS Center for Excellence in Quantum Information and Quantum Physics, University of Science and Technology of China, Hefei 230026, China
  • 3Hefei National Laboratory, University of Science and Technology of China, Hefei 230088, China
  • 4School of Biomedical Engineering and Suzhou Institute for Advanced Research, University of Science and Technology of China, Suzhou 215123, China

  • *These authors contributed equally to this work.
  • †xie1021@ustc.edu.cn
  • ‡ckduan@ustc.edu.cn
  • §djf@ustc.edu.cn
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Phys. Rev. B 107, L140101 – Published 5 April, 2023

DOI: https://doi.org/10.1103/PhysRevB.107.L140101

Abstract

Revealing the properties of single spin defects in solids is essential for quantum applications based on solid-state systems. However, it is intractable to investigate the temperature-dependent properties of single defects, due to the low precision for single-defect measurements in contrast to defect ensembles. Here we report that the temperature dependence of the Hamiltonian parameters for single negatively charged nitrogen-vacancy centers in diamond at room temperature is precisely measured and the results are in reasonable agreement with first-principles calculations. In particular, the hyperfine interactions with randomly distributed C13 nuclear spins are clearly observed to vary with temperature and the relevant coefficients are measured with hertz-level precision. The temperature-dependent behaviors are attributed to both thermal expansion and lattice vibrations by first-principles calculations. Our results pave the way for taking nuclear spins as more stable thermometers at nanoscale. The methods developed here for high-precision measurements and first-principles calculations can be further extended to other solid-state spin defects.

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Phys. Rev. B 107, L140101– Published 5 April, 2023
  • Received 14 September 2022
  • Accepted 21 March 2023
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