We measure electron- and nuclear-spin transition frequencies in the ground state of nitrogen-vacancy (N-) centers in diamond for two nitrogen isotopes (N- and N-) over temperatures ranging from 77 to 400 K. Measurements are performed using Ramsey interferometry and direct optical readout of the nuclear and electron spins. We extract coupling parameters (for N-), , , , and , and their temperature dependences for both isotopes. The temperature dependences of the nuclear-spin transitions within the spin manifold near room temperature are found to be 0.52(1) ppm/K for N-(| = -1⟩ ↔ | = +1⟩) and -1.1(1) ppm/K for N-(| = -1/2⟩ ↔ | = +1/2⟩). An isotopic shift in the zero-field splitting parameter between N- and N- is measured to be ~ 120 kHz. Residual transverse magnetic fields are observed to shift the nuclear-spin transition frequencies, especially for N-. We have precisely determined the set of parameters relevant for the development of nuclear-spin-based diamond quantum sensors with greatly reduced sensitivity to environmental factors.
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| http://dx.doi.org/10.1103/PhysRevApplied.19.064084 | DOI Listing |
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