Study on the effect of near-infrared light on spin-charge state conversion in diamond $ NV^{-} $ color center

Journal Information

J. Hefei Univ. Tech. (Nat. Sci.), Aug.2025, Vol.48 No.8: 1112-1116

DOI: 10.3969/j.issn.1003-5060.2025.08.016

Authors

HU Jun $ ^{1} $, QIAN Peng $ ^{1} $, ZHANG Heng $ ^{2} $, ZHANG Yang $ ^{1} $, MA Yu $ ^{1} $

(1. School of Physics, Hefei University of Technology, Hefei 230601, China; 2. School of Microelectronics, Hefei University of Technology, Hefei 230601, China)

Abstract and Keywords

Abstract: In this paper, the near-infrared light is used to modulate the fluorescence time track produced by the 532 nm laser irradiation on the diamond nitrogen-vacancy(NV) color center. It is found that the modulation depth is different under different initial states of electron spin. Because the 589 nm laser only excites the color center in the negatively charged state( $ NV^{-} $ color center), the change of the population of the charge state caused by the excitation of the color center alone by the 589 nm laser with different powers and the co-excitation with the near-infrared light is studied. The experimental results show that near-infrared light can accelerate the process of $ NV^{-} $ color center ionization, but the acceleration rate caused by different initial states of electron spin is different. The reason for this difference may be that the near-infrared light has a higher efficiency for the ionization of the spin singlet state than for the excited state. The above research results are of great significance to the spin quantum state readout and quantum precise measurement based on the diamond $ NV^{-} $ color center.

Keywords: nitrogen-vacancy(NV) color center; charge state; near-infrared light; spin state

作者信息

胡钧 $ ^{1} $，钱鹏 $ ^{1} $，张恒 $ ^{2} $，张杨 $ ^{1} $，马钰 $ ^{1} $

(1. 合肥工业大学物理学院, 安徽合肥 230601; 2. 合肥工业大学微电子学院, 安徽合肥 230601)

摘要和关键词

摘要: 文章利用近红外光对 532 nm 激光照射金刚石氮空位(nitrogen-vacancy, NV)色心产生的荧光时间轨迹进行调制, 发现不同电子自旋初态下的调制深度并不相同; 由于 589 nm 激光只激发处于负电性电荷态的色心(NV⁻ 色心), 进而研究不同功率的 589 nm 激光单独激发色心和加入近红外光共同激发色心导致的电荷态布居变化。实验结果表明, 近红外光能够加快 NV⁻ 色心电离的过程, 但是不同电子自旋初态导致的电离速率有所差异, 造成该差异的原因可能是近红外光对 NV⁻ 色心自旋单态的电离比激发态的电离具有更高的效率。文章研究结果对基于金刚石 NV⁻ 色心的自旋量子态读出和量子精密测量具有重要意义。

关键词: 氮空位(NV)色心；电荷态；近红外光；自旋态

Funding

国家自然科学基金资助项目（11904070）

合肥工业大学学报(自然科学版)

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