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Detecting external electron spins using nitrogen-vacancy centers

机译：使用氮空位中心检测外部电子自旋

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Near-surface nitrogen-vacancy (NV) centers have been created in diamond through low-energy implantation of ~(15)N to sense electron spins that are external to the diamond. By performing double resonance experiments, we have verified the presence of g = 2 spins on a diamond crystal that was subjected to various surface treatments, including coating with a polymer film containing the free radical 2,2-diphenyl- l-picrylhydrazyl. Subsequent acid cleaning eliminated the spin signal without otherwise disrupting the NV center, providing strong evidence that the spins were at the surface. A clear correlation was observed between the strength of the external spin signal and the relaxation time T_2 for the six NV centers studied. We have developed a model that takes into account the finite correlation time of the fluctuating magnetic fields generated by the external spins, and used it to infer the signal strength and correlation time of the magnetic fields from these spins. This model also highlights the sensitivity advantage of active manipulation of the longitudinal spin component via double resonance over passive detection schemes that measure the transverse component of spin.
机译：通过〜（15）N的低能注入在钻石中创建了近表面的氮空位（NV）中心，以感应钻石外部的电子自旋。通过进行双共振实验，我们已经验证了经受各种表面处理（包括涂有含有自由基2，2-二苯基-1-吡啶甲基肼基的聚合物膜）的金刚石晶体上g = 2自旋的存在。随后的酸清洗消除了自旋信号，而不会破坏NV中心，提供了有力证据表明自旋在表面。对于六个研究的NV中心，在外部自旋信号的强度和弛豫时间T_2之间观察到明显的相关性。我们已经开发了一个模型，该模型考虑了外部自旋产生的波动磁场的有限相关时间，并用它来推断这些自旋产生的磁场的信号强度和相关时间。该模型还强调了通过双共振主动测量纵向旋转分量的灵敏度优势，而不是测量旋转横向分量的被动检测方案。

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