Sidebands in Optically Detected Magnetic Resonance Signals of Nitrogen   Vacancy Centers in Diamond
  We study features in the optically detected magnetic resonance (ODMR) signals associated with negatively charged nitrogen-vacancy (NV) centers coupled to other paramagnetic impurities in diamond. Our results are important for understanding ODMR line shapes and for optimization of devices based on NV centers. We determine the origins of several side features to the unperturbed NV magnetic resonance by studying their magnetic field and microwave power dependences. Side resonances separated by around 130 MHz are due to hyperfine coupling between NV centers and nearest-neighbor C-13 nuclear spins. Side resonances separated by approximately {40, 260, 300} MHz are found to originate from simultaneous spin flipping of NV centers and single substitutional nitrogen atoms. All results are in agreement with the presented theoretical calculations. 
Maria Simanovskaia, Kasper Jensen, Andrey Jarmola, Kurt Aulenbacher,   Neil Manson, and Dmitry Budker
physics.atom-ph quant-ph