Sensitive detection of level anti-crossing spectra of nitrogen-vacancy centers in diamond

Abstract

We report a study of the magnetic field dependence of photoluminescence of NV${}^{-}$ centers (negatively charged nitrogen-vacancy centers) in diamond single crystals. In such a magnetic field dependence characteristic sharp features are observed, which are coming from Level Anti-Crossings (LACs) in a coupled electron-nuclear spin system. For sensitive detection of such LAC-lines we use lock-in detection to measure the photoluminescence intensity. This experimental technique allows us to obtain new LAC lines. Additionally, a remarkably strong dependence of the LAC-lines on the modulation frequency is found. Specifically, upon decrease of the modulation frequency from 12 kHz to 17 Hz the amplitude of the LAC-lines increases by approximately two orders of magnitude. To take a quantitative account for such effects, we present a theoretical model, which describes the spin dynamics in a coupled electron-nuclear spin system under the action of an oscillating external magnetic field. Good agreement between experiments and theory allows us to conclude that the observed effects are originating from coherent spin polarization exchange in a coupled spin system comprising the spin-polarized NV${}^{-}$ center. Our results are of great practical importance allowing one to optimize the experimental conditions for probing LAC-derived lines in diamond crystals comprising NV${}^{-}$ centers and for indirect detection and identification of other paramagnetic defect centers.

9 pages, 8 figures. arXiv admin note: substantial text overlap with arXiv:1609.06661

References in corpus (13)

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Cited by in corpus (9)

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• Eddy-current imaging with nitrogen-vacancy centers in diamond
• Photoluminescence at the ground state level anticrossing of the nitrogen-vacancy center in diamond
• Dynamic ${}^{14}\mathrm{N}$ nuclear spin polarization in nitrogen-vacancy centers in diamond
• A method for simulating level anti-crossing spectra of diamond crystals containing NV${}^{-}$ color centers
• Level-crossing induced spin phenomena in SiC: a theoretical study
• Radiofrequency response of the optically detected level anti-crossing signal in NV color centers in diamond in zero and weak magnetic fields
• All-Optical Photoluminescence Response of Nitrogen-Vacancy Ensembles in Diamond at Low Magnetic Fields
• Optically detected flip-flops between different spin ensembles in diamond