Fig. 2: Optical detection of 13C nuclear spins in hBN.
From: Single nuclear spin detection and control in a van der Waals material
a–c, ODMR contrast map of 13C-implanted hBN by driving a microwave at: 2.01 GHz, resonance I-2 of group I defects (a); 1.95 GHz, resonance II-2 of group II defects (b); and 1.86 GHz, resonance III-2 of group III defects (c). d–f, ODMR contrast map of 12C-implanted hBN by driving the microwave at: I-2 (d), II-2 (e) and III-2 (f). The contrast fluctuation outside the hBN is caused by the low photon counts collected from the background. Scale bars, 5 μm. A 71.5-mT magnetic field is applied out of plane (perpendicular to the hBN nanosheet). g, Illustration of the ODNMR sequence. h, An ODNMR spectrum of defect 2 by driving the microwave at II-2. i, An ODNMR spectrum of defect 3 by driving the microwave at III-4.
