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arXiv 2104.09463cond-mat.mes-hallcond-mat.stat-mech
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氮空位中心金刚石与表面和体相杂质相互作用产生的磁场噪声分析

Magnetic field noise analyses generated by the interactions between a nitrogen vacancy center diamond and surface and bulk impurities

Philip Chrostoski, Bruce Barrios, D. H. Santamore

摘要:

我们研究了由于表面和体杂质的磁噪声的机制。对于表面噪声,我们应用自旋涨落理论中的朗之万方法计算了吸附在薄层水中的顺磁性表面杂质的噪声。我们发现产生噪声的机制是自旋翻转和自旋进动,这两种机制取决于杂质自旋弛豫和自旋进动时间。对于体噪声,我们考虑碳-13和氮作为杂质,并采用相关集团展开来计算噪声。由于在典型的NV中心金刚石系统中较高的杂质密度,碳-13噪声比氮大几个数量级。我们还发现,在长期近似的噪声低估了低施加磁场下的噪声。总体而言,磁场噪声的主要来源是自旋进动噪声,其比自旋翻转噪声大五个数量级以上。

英文摘要:

We investigated the mechanism of magnetic noise due to both surface and bulk impurities. For surface noise, we apply the Langevin method to spin fluctuation theory to calculate the noise for paramagnetic surface impurities absorbed in a thin layer of water. We find that the mechanisms generating noise are spin flip and spin precession which depend on impurity spin relaxation and spin precession time. For the bulk noise, we consider carbon-13 and nitrogen as impurities and employ the correlated-cluster expansion to calculate noise. Carbon-13 noise is a few orders of magnitude larger than nitrogen due to the higher impurity density in the typical NV center diamond system. We also find that the noise in the secular approximation underestimates noise under low applied magnetic field. Overall, the major source of magnetic field noise is spin precession noise, which is more than five orders of magnitude larger than the spin flip noise.

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