Fig. 2: Characterization of spin defects in an ensemble of BNNTs.
From: Quantum sensing with spin defects in boron nitride nanotubes
a Photoluminescence (PL) spectrum of the emitting defects. b ODMR spectra recorded at different bias magnetic field strengths. c ODMR spectrum of BNNT spin defect ensembles at 78 mT. Blue dots show the experimental data, with a fitted Lorentzian line shape overlaid in light blue. d Rabi oscillations recorded at various input MW powers (in Watts). The black line shows the experimental Rabi oscillation under optimized conditions of maximum input MW power, showing a pronounced beating pattern. e Rabi frequency plotted as a function of the square root of the MW power, confirming the expected linear dependence. f Fast Fourier transform (FFT) of the Rabi oscillation at max. MW power revealing two main frequency components: a dominant peak near 50 MHz and a smaller peak at twice that frequency, typically observed in spin pairs.
