Selective measurement of charge dynamics in an ensemble of nitrogen-vacancy centers in nano- and bulk diamonds
arXiv:1812.02702 · doi:10.1103/PhysRevB.99.155426
Abstract
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) charge state, while the negatively charged (NV) form is more stable in bulk.
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- Microwave-assisted spectroscopy technique for studying charge state in nitrogen-vacancy ensembles in diamond
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- Revealing Collective Emission in the Single-to-Bulk Transition of Quantum Emitters in Nanodiamond Agglomerates
- Wavelet-resolved coherence beats in the Overhauser field of a thermal nuclear spin ensemble
- Self-assembled fluorescent nanodiamond layers for quantum imaging
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- Spin-Relaxation of Dipolar-Coupled Nitrogen-Vacancy Centers : The role of Double-flip Processes
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