Journal
NEW JOURNAL OF PHYSICS
Volume 14, Issue -, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.1088/1367-2630/14/10/103041
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Funding
- Agence Nationale de la Recherche
- Conicyt Fondecyt [11100265]
- Millennium Scientific Initiative [P10-035-F]
- US Air Force [FA9550-12-1-0214]
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We study, both theoretically and experimentally, the free induction decay (FID) of the electron spin associated with a single nitrogen-vacancy defect in high-purity diamond, where the main source of decoherence is the hyperfine interaction with a bath of C-13 nuclear spins. In particular, we report a systematic study of the FID signal as a function of the strength of a magnetic field oriented along the symmetry axis of the defect. On average, an increment of the coherence time by a factor of root 5/2 is observed at high magnetic field in diamond samples with a natural abundance of C-13 nuclear spins, in agreement with numerical simulations and theoretical studies. Further theoretical analysis shows that this enhancement is independent of the concentration of nuclear-spin impurities. By dividing the nuclear-spin bath into shells and cones, we theoretically identify the nuclear spins responsible for the observed dynamics.
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