Long spin coherence times of nitrogen vacancy centers in milled nanodiamonds
Long spin coherence times of nitrogen vacancy centers in milled nanodiamonds
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DOI：
10.1103/physrevb.105.205401
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发表时间：
2021-12
影响因子：
3.7
通讯作者：
B. D. Wood;G. Stimpson;J. March;Y. Lekhai;C. Stephen;B. Green;A. Frangeskou;L. Gin'es;S. Mandal;O. Williams;Gavin W. Morley
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文献类型：
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作者：
B. D. Wood;G. Stimpson;J. March;Y. Lekhai;C. Stephen;B. Green;A. Frangeskou;L. Gin'es;S. Mandal;O. Williams;Gavin W. Morley
含有带负电的氮空位中心（${\text{NV}}^{-}$）的纳米金刚石可用作生物材料中的局部传感器，并已被提议作为探测空间叠加的宏观极限和重力的量子性质的平台。这些应用的一个关键要求是获得包含 ${\text{NV}}^{-}$ 且具有长自旋相干时间的纳米金刚石。与蚀刻不同，使用铣削制造纳米金刚石可以一次性处理大块材料的完整 3D 体积，但到目前为止，${\text{NV}}^{-}$ 自旋相干时间有限。在这里，我们使用通过化学气相沉积法生长的块状金刚石 ${\text{Si}}_{3}{\text{N}}_{4}$ 球磨生产的天然同位素丰度纳米金刚石，平均单次替代氮浓度为 $121 ~\text{ppb}$。我们表明，在室温下，通过动态解耦，这些纳米金刚石中 ${\text{NV}}^{-}$ 中心的电子自旋相干时间可以超过 $400 ~\mu\text{s}$。扫描电子显微镜提供了包含 ${\text{NV}}^{-}$ 的特定纳米金刚石的图像，并对其自旋相干时间进行了测量。
Nanodiamonds containing negatively charged nitrogen vacancy centres (${\text{NV}}^{-}$) have applications as localized sensors in biological material and have been proposed as a platform to probe the macroscopic limits of spatial superposition and the quantum nature of gravity. A key requirement for these applications is to obtain nanodiamonds containing ${\text{NV}}^{-}$ with long spin coherence times. Using milling to fabricate nanodiamonds processes the full 3D volume of the bulk material at once, unlike etching, but has, up to now, limited ${\text{NV}}^{-}$ spin coherence times. Here, we use natural isotopic abundance nanodiamonds produced by ${\text{Si}}_{3}{\text{N}}_{4}$ ball milling of bulk diamond grown by chemical vapour deposition with an average single substitutional nitrogen concentration of $121 ~\text{ppb}$. We show that the electron spin coherence times of ${\text{NV}}^{-}$ centres in these nanodiamonds can exceed $400 ~\mu\text{s}$ at room temperature with dynamical decoupling. Scanning electron microscopy provides images of the specific nanodiamonds containing ${\text{NV}}^{-}$ for which a spin coherence time was measured.