Ultrafast Conversion of Two Charge States of Nitrogen-Vacancy Centers in Diamond via Two-Photon Excitation

Ultrafast conversion dynamics between the NV<sup>0</sup> and NV<sup>-</sup> charge states in diamond is crucial for spin-state manipulation and readout. However, the underlying mechanism of the conversion, including the effective excitation wavelength, the time scales of the conversion, and the influencing factors, is still unclear. Here, we proposed a method to probe the ultrafast conversion of the two charge states via two-photon excitation with femtosecond laser pulses separated by 12.5 ns. We found that the highest conversion efficiency occurs at the excitation wavelength of around 532 nm, and the efficiency increases with temperature as well. The conversion time from NV<sup>0</sup> to NV<sup>-</sup> is obtained to be around 75 ps at 300 K. These findings advance the understanding of NV center charge-state dynamics and provide insights for high-speed spin readout in quantum information applications.

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Publication Details

Journal
Nano Letters
Published
2025-10-24
DOI
https://doi.org/10.1021/acs.nanolett.5c05150
Primary Topic
Diamond and Carbon-based Materials Research
Type
article
Field-Weighted Citation Impact
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article

Ultrafast Conversion of Two Charge States of Nitrogen-Vacancy Centers in Diamond via Two-Photon Excitation

Changcheng Zheng, Zhicheng Su, Zhenhua Ni, Zheng-Yuan Xue et al.
Nano Letters
Diamond and Carbon-based Materials Research
article

Ultrafast Conversion of Two Charge States of Nitrogen-Vacancy Centers in Diamond via Two-Photon Excitation

Changcheng Zheng, Zhicheng Su, Zhenhua Ni, Zheng-Yuan Xue, Junpeng Lü, Dali Sun, Jiqiang Ning, Yu‐Long Wang, Shijie Xu, Mengting Yang, Y.H. Lu
article en

Abstract

Ultrafast conversion dynamics between the NV<sup>0</sup> and NV<sup>-</sup> charge states in diamond is crucial for spin-state manipulation and readout. However, the underlying mechanism of the conversion, including the effective excitation wavelength, the time scales of the conversion, and the influencing factors, is still unclear. Here, we proposed a method to probe the ultrafast conversion of the two charge states via two-photon excitation with femtosecond laser pulses separated by 12.5 ns. We found that the highest conversion efficiency occurs at the excitation wavelength of around 532 nm, and the efficiency increases with temperature as well. The conversion time from NV<sup>0</sup> to NV<sup>-</sup> is obtained to be around 75 ps at 300 K. These findings advance the understanding of NV center charge-state dynamics and provide insights for high-speed spin readout in quantum information applications.

Nano LettersVol. 25(44)
Fudan University (CN), Department of Physics, Mathematics and Informatics (BY), Duke Kunshan University (CN), Applied Natural Sciences (US), Heinz Optical Engineering (United States) (US), Southeast University (CN)
Openalex Percentile: Top 76%
Diamond and Carbon-based Materials Research
DOISourceOpenAlex
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