AI 中文总结
该研究利用NV中心的DEER光谱，揭示CVD金刚石中辐照诱导的自旋浴演化与原生氢缺陷，建立自旋浴对NV中心相干性影响的模型，为量子传感用金刚石材料优化提供关键支撑。
AI 中文摘要
本文旨在为读者提供利用双电子-电子共振（DEER）光谱优化制备高T2相干时间金刚石的研究进展与当前技术水平。采用DEER光谱，我们研究了原生化学气相沉积（CVD）金刚石及后续处理后顺磁缺陷的形成、转变与退火行为。电子辐照会在DEER光谱中产生额外的S=1/2共振信号，我们认为其对应复合X系综。通过跟踪650℃至1200℃退火过程中X系综与P1点缺陷的浓度变化，发现X系综初始由V-自旋和间隙自旋混合构成，约650℃时消失；空位在退火过程中迁移形成团簇，持续至1000℃，1200℃退火时消失，对X系综信号有贡献。我们建立了混合自旋浴对NV中心相干性影响的模型，包含与P1中心、V-中心、双空位及间隙的独立耦合。详细的DEER研究使我们能够揭示并分辨出两种额外的与氢相关的弱S=1/2物种信号：NVH-和替位氢缺陷，其与空位谱线重叠。综上，NV-DEER方法是高精度、纳米级分辨率研究金刚石中顺磁缺陷的有力工具，对材料优化至关重要；所实现的高T2相干时间与自旋浴模型一致，晶体达到高级量子传感应用所需的质量。
英文摘要
The aim of this paper is to provide the reader with a review and current state of the art of the fabrication of high T2 coherence diamond, optimised by the use of double electron-electron resonance (DEER) spectroscopy. Using DEER, we study the formation, transformation, and annealing of paramagnetic defects in as-grown CVD diamond and after post-processing. Electron irradiation leads to the formation of an additional S = 1/2 resonance in the DEER spectrum, which we consider to be a composite X ensemble. By tracking the concentrations of X and P1 point defects during annealing from 650C to 1200C, we find that the X ensemble initially consists of a mixture of V- spins and interstitial spins, which disappear at about 650C. Vacancies migrate during annealing, forming clusters that persist to 1000C and disappear upon annealing at 1200C, contributing to the X ensemble signal. We have developed a model of the influence of the mixed spin bath on the coherence of NV centers, which includes independent couplings with P1 centers, V-, divacancies, and interstitials. Detailed DEER studies allowed us to reveal and resolve a weak signal from two additional S = 1/2 species associated with hydrogen: NVH- and consistent with a substitutional hydrogen defect, which overlaps the vacancy spectral line. Taken together, these results show that the NV-DEER method is a powerful tool for investigating paramagnetic defects in diamond with high precision and nanoscale resolution, essential for material optimisation. The achieved high T2 coherence time is consistent with the spin bath model, and the crystals reach the quality required for advanced quantum sensing applications.
Journal refO. Rubinas, J. Prooth, M. Petrov, et al. Advanced Functional Materials (2026): e32037
