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arXiv 1812.02702cond-mat.mes-hall
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纳米和大块金刚石中氮空位中心系综中电荷动力学的选择性测量

Selective measurement of charge dynamics in an ensemble of nitrogen-vacancy centers in nano- and bulk diamonds

R. Giri, C. Dorigoni, S. Tambalo, F. Gorrini, A. Bifone

摘要:

金刚石中的氮空位(NV)中心在弱磁场(例如由生物系统产生的磁场)传感方面引起了相当大的兴趣。检测这种微弱的信号需要近地表的NV中心,以减少NV和源之间的距离。此外,NV的密集集合对于减少测量时间是高度期望的。然而,在这些系统中经常观察到鲁棒的电荷状态切换,导致电荷和自旋动力学之间的复杂相互作用,这可以降低可达到的自旋极化水平,从而降低灵敏度。因此,了解电荷状态切换背后的机制对于开发基于NV的传感器至关重要。在这里,我们展示了一种新的方法来选择性地测量在NVs的合奏通过淬火使用离轴磁场的自旋极化的电荷动力学。利用这种技术,我们表明,在纳米金刚石,电荷状态的不稳定性随着NV密度的增加而增加。在块状单晶金刚石的情况下,我们表明,位于表面附近的NV中心更稳定的中性(NV $^{0}$)的电荷状态,而带负电荷的(NV $^{-}$)的形式是更稳定的散装。

英文摘要:

Nitrogen-vacancy (NV) centers in diamond have attracted considerable interest in sensing of weak magnetic fields, such as those created by biological systems. Detecting such feeble signals requires near-surface NV centers, to reduce the distance between NVs and sources. Moreover, dense ensembles of NVs are highly desirable to reduce measurement time. However, robust charge state switching is often observed in these systems, resulting in a complex interplay between charge and spin dynamics that can reduce the attainable level of spin polarization, and consequently, sensitivity. Understanding the mechanisms behind charge state switching is, therefore, crucial to developing NV based sensors. Here, we demonstrate a novel method to selectively measure charge dynamics in an ensemble of NVs by quenching the spin polarization using an off-axis magnetic field. Utilizing this technique, we show that, in nanodiamonds, charge state instability increases with increasing NV density. In the case of bulk single crystal diamond, we show that NV centers located near the surface are more stable in the neutral (NV$^{0}$) charge state, while the negatively charged (NV$^{-}$) form is more stable in bulk.

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