Charge stability and charge-state-based spin readout of shallow nitrogen-vacancy centers in diamond
| Autor: | Giri, Rakshyakar, Jensen, Rasmus H., Khurana, Deepak, Bocquel, Juanita, Radko, Ilya P., Lang, Johannes, Osterkamp, Christian, Jelezko, Fedor, Berg-Sorensen, Kirstine, Andersen, Ulrik L., Huck, Alexander |
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| Rok vydání: | 2022 |
| Předmět: | |
| Druh dokumentu: | Working Paper |
| Popis: | Spin-based applications of the negatively charged nitrogen-vacancy (NV) center in diamonds require efficient spin readout. One approach is the spin-to-charge conversion (SCC), relying on mapping the spin states onto the neutral (NV$^0$) and negative (NV$^-$) charge states followed by a subsequent charge readout. With high charge-state stability, SCC enables extended measurement times, increasing precision and minimizing noise in the readout compared to the commonly used fluorescence detection. Nano-scale sensing applications, however, require shallow NV centers within a few $\si{\nano \meter}$ distance from the surface where surface related effects might degrade the NV charge state. In this article, we investigate the charge state initialization and stability of single NV centers implanted $\approx \SI{5}{\nano \meter}$ below the surface of a flat diamond plate. We demonstrate the SCC protocol on four shallow NV centers suitable for nano-scale sensing, obtaining a reduced readout noise of 5--6 times the spin-projection noise limit. We investigate the general applicability of SCC for shallow NV centers and observe a correlation between NV charge-state stability and readout noise. Coating the diamond with glycerol improves both charge initialization and stability. Our results reveal the influence of the surface-related charge environment on the NV charge properties and motivate further investigations to functionalize the diamond surface with glycerol or other materials for charge-state stabilization and efficient spin-state readout of shallow NV centers suitable for nano-scale sensing. Comment: 9 pages, 5 figures |
| Databáze: | arXiv |
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