Abstract

The spectra of the optically detected magnetic resonance for single NV^– centers have been experimentally studied in two solid-state samples in the range of hyperfine interactions between the electron spin and the nitrogen nucleus spin in the same NV^– center. This study has been aimed at reaching a maximal microwave frequency resolution in the experimental setup used. For measurements, two low-nitrogen (no higher than 50 ppb) diamond single-crystal samples have been grown. Measured time \(T_{2}^{*}\) of the spin decoherence in NV^– centers was about 2 μs in one sample and 20 μs in the other. For both samples, the spectrum of the optically detected magnetic resonance for the hyperfine splitting of a single NV^– center and ¹⁴N atom has been taken and investigated. The resolution in these samples has been estimated at a level of 3.5 and 0.18 MHz, respectively. It has been noted that the resolution of the spectrum improves with increasing time \(T_{2}^{*}\) of the spin decoherence of the single NV^– center.

中文翻译：

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金刚石单 NV 中心光学检测磁共振的测量灵敏度

摘要

已经在两个固态样品中对同一 NV 中心的电子自旋和氮核自旋之间的超精细相互作用范围内的单个 NV^中心的光学检测磁共振光谱进行了实验研究。本研究的目的是在所使用的实验装置中达到最大微波频率分辨率。为了进行测量，已经生长了两个低氮（不高于 50 ppb）金刚石单晶样品。^测得的NV中心自旋退相干时间\(T_{2}^{*}\)在一个样本中约为 2 μs，在另一个样本中约为 20 μs。对于这两个样品，已经获取并研究了单个 NV 中心和 14 N 原子^超精细^分裂的光学检测磁共振光谱。这些样本的分辨率估计分别为 3.5 和 0.18 MHz。值得注意的是，光谱的分辨率随着单个 NV 中心自旋退相干时间^\ ( T_{2}^{*}\)的增加而提高。