Temperature-dependent behaviors of single spin defects in solids determined with Hz-level precision

• URL: http://arxiv.org/abs/2212.02849v1
• Date: Tue, 6 Dec 2022 09:37:12 GMT
• Title: Temperature-dependent behaviors of single spin defects in solids determined with Hz-level precision
• Authors: Shaoyi Xu, Mingzhe Liu, Tianyu Xie, Zhiyuan Zhao, Qian Shi, Pei Yu, Chang-Kui Duan, Fazhan Shi, Jiangfeng Du
• Abstract summary: We report the temperature dependence of the Hamiltonian parameters for single negatively charged nitrogen-vacancy centers in diamond. The hyperfine interactions with randomly distributed $13$C nuclear spins are clearly observed to vary with temperature. Our results pave the way for taking nuclear spins as more stable thermometers at nanoscale.
• Score: 15.105963565523119
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• 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 (NV$^{-}$) centers in diamond is precisely measured, and the results find a reasonable agreement with first-principles calculations. Particularly, the hyperfine interactions with randomly distributed $^{13}$C nuclear spins are clearly observed to vary with temperature, and the relevant coefficients are measured with Hz-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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