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Bulletin of the American Physical Society

Rotating Frame Spin dynamics of a Single Nitrogen Vacancy Center in Diamond Nanocrystal

Abdelghani Laraoui, Carlos A. Meriles

Published Feb 27, 2012• 0 citations
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We investigate the spin dynamics of a nitrogen-vacancy (NV) center contained in an individual diamond nanocrystal in the presence of continuous microwave excitation. Upon periodic reversal of the microwave phase, we observe a train of ``Solomon echoes'' that effectively extends the system coherence lifetime to reach several tens of microseconds, depending on the microwave power and phase inversion rate. Starting from a model where the NV center interacts with a bath of paramagnetic defects on the nanocrystal surface, we use average Hamiltonian theory to compute the signal envelope from its amplitude at the echo maxima. A comparison between the effective Rabi and Solomon propagators shows that the observed response can be understood as a form of higher-order decoupling from the spin bath.
Photoluminescence excitation spectroscopy of nitrogen vacancy (NV) centers in type Ib diamond nanocrystals shows that in spite of spectral diffusion and spin-nonconserving transitions, zero-phonon linewidth as small as 16MHz16\phantom{\rule{0.3em}{0ex}}\mathrm{MHz}16MHz, which is nearly lifetime limited, can be observed at low temperature. Relatively small effects of spectral diffusion have also been observed in a small fraction of NV centers.
Diamond nanocrystals containing highly photoluminescent color centers are attractive, nonclassical, and near-field light sources. For near-field applications, the size of the nanocrystal is crucial, since it defines the optical resolution. Nitrogen-vacancy (NV) color centers are efficiently created by proton irradiation and annealing of a nanodiamond powder. Using near-field microscopy and photon statistics measurements, we show that nanodiamonds with sizes down to 25 nm can hold a single NV color center with bright and stable photoluminescence.