Fig. 4: Sub-linewidth structure and angle-dependence of below-saturation ODMR spectra.
From: Room-temperature optically detected magnetic resonance of single defects in hexagonal boron nitride
a Unsaturated (Psatmicrowave and 1.2Psatoptical) normalised ODMR spectra for defect A with double-Lorentzian fits at a range of magnetic-field strengths. Coloured circles are the experimental results obtained at 7 mT, 14 mT, 25 mT and 89 mT, coloured solid curves are double-Lorentzian fits. For each panel, the shaded blue and red Lorentzian lineshapes show the two components of the doublet. b The ODMR frequency of each component of the double-Lorentzian fit, as a function of magnetic field. c–h Below-saturation normalised ODMR spectra for defects B, C, D, E, F and G obtained at 25 mT with a fixed in-plane magnet position. Shaded regions indicate the two components of the doublet Lorentzian fits. (i) ODMR simulation for S = 1 system with D = 14 MHz and E = 4 MHz (j) ODMR simulation for \(S={\frac{3}{2}}\) system with D = 7 MHz and E = 2 MHz. In both (i) and (j) the magnetic field applied along the lab frame axis z and the defects symmetry axis (principal axis of defect’s D tensor) z′. The signal intensity is normalised to 1 and represented by the blue shaded region.
