基于金刚石氮-空位磁猝灭的量子传感用于空间自旋噪声映射
Quantum Sensing for Spatial Spin Noise Mapping via Nitrogen-Vacancy Magnetic Quenching in Diamond
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中文总结 AI 辅助
本文提出一种基于金刚石氮-空位中心的无微波磁猝灭方法，用于宽场空间自旋噪声映射，并通过实验验证其在多种材料上的有效性。
中文摘要 AI 辅助
检测和映射自旋噪声可以揭示表面缺陷态、催化残留物、自由基和自旋电子材料中的空间变化。然而，体相测量会平均空间异质性，而扫描探针映射需要顺序光栅扫描。在此，我们展示了一种利用金刚石中氮-空位（NV）中心进行宽场自旋噪声映射的无微波磁猝灭（MQ）方法。该方案结合了连续LED照明和低频、幅度调制的磁场，避免了共振微波输送或脉冲光学硬件。场致自旋态混合降低了NV光致发光，提供了主要对比机制。我们研究了响应随光功率和磁调制幅度的变化，并使用自旋态混合模型解释结果。该方法通过含水钆布醇浓度系列得到验证，显示出与光探测磁共振（ODMR）测量一致的趋势。我们映射了六方氮化硼和单壁碳纳米管样品中具有不同缺陷和金属催化剂贡献的自旋噪声变化，并辅以电子显微镜和光谱学支持。值得注意的是，MQ检测到六方氮化硼纳米管中的自旋噪声响应，而该响应在体相EPR光谱中静默。该方法为跨量子技术和先进功能材料的空间分辨自旋噪声传感提供了实用框架。
英文摘要
Detecting and mapping spin noise can reveal spatial variations in surface defect states, catalytic residues, free radicals, and spintronic materials. However, bulk measurements average over spatial heterogeneity, while scanning-probe maps require sequential rastering. Here, we demonstrate a microwave-free magnetic quenching (MQ) method for wide-field spin-noise mapping using nitrogen-vacancy (NV) centres in diamond. The protocol combines continuous LED illumination with a low-frequency, amplitude-modulated magnetic field, avoiding resonant microwave delivery or pulsed optical hardware. Field-induced spin-state mixing reduces NV photoluminescence, providing the primary contrast mechanism. We examine the response as a function of optical power and magnetic modulation amplitude, interpreting the results using a spin-state mixing model. The method is validated with aqueous gadobutrol concentration series, showing trends consistent with optically detected magnetic resonance (ODMR) measurements. We map spin-noise variations across boron nitride and single-walled carbon nanotube samples with differing defect and metallic catalyst contributions, supported by electron microscopy and spectroscopy. Notably, MQ detects a spin-noise response in boron nitride nanotubes that is silent in bulk EPR spectroscopy. This approach provides a practical framework for spatially resolved spin-noise sensing across quantum technologies and advanced functional materials.
