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arXiv 1209.3748cond-mat.mes-hall
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利用氮空位中心探测外电子自旋

Detecting External Electron Spins Using Nitrogen-Vacancy Centers

H. J. Mamin, M. H. Sherwood, D. Rugar

摘要:

近表面氮空位(NV)中心已经通过15 N的低能量注入在金刚石中产生,以感测金刚石外部的电子自旋。通过进行双共振实验,我们已经验证了g=2自旋的金刚石晶体上进行了各种表面处理,包括涂层与含有自由基2,2-二苯基-1-苦基肼(DPPH)的聚合物膜的存在。随后的酸洗消除了自旋信号,而没有破坏NV中心,提供了强有力的证据表明自旋在表面。一个明确的相关性之间观察到的检测到的自旋信号的大小和弛豫时间T2的六个NV中心的研究。我们已经开发了一个模型,考虑到有限的相关时间的波动磁场产生的外部自旋,并使用它来推断的信号强度和相关时间的磁场从这些自旋。该模型还强调了通过双共振主动操纵纵向自旋分量的灵敏度优势,而被动检测方案测量自旋的横向分量。

英文摘要:

Near-surface nitrogen-vacancy (NV) centers have been created in diamond through low energy implantation of 15N 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-1-picrylhydrazyl (DPPH). 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 size of the detected spin signal and the relaxation time T2 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.

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