The authors demonstrate that hBN samples from various sources, including bulk crystals, nanopowders, and epitaxial films, all contain optically addressable spin pairs that can be detected via optically detected magnetic resonance (ODMR) spectroscopy. These spin pairs exhibit emission wavelengths spanning a continuous range from violet (420 nm) to near-infrared (1000 nm).
The ODMR contrast is relatively consistent across the different emission wavelengths and sample types, suggesting a universal underlying mechanism for the spin pair formation. The authors further show that the spin pairs can be coherently controlled through Rabi oscillations, regardless of the emission wavelength.
Additionally, the authors investigate the co-existence of the spin pairs with boron vacancy (V-B) defects in electron-irradiated hBN samples. They identify that 785 nm laser excitation selectively addresses the spin pairs without exciting the V-B defects, while 532 nm excitation is optimal for V-B readout. This demonstrates the ability to independently address multiple spin species in hBN, which could be useful for quantum technologies.
Overall, the results establish hBN as a uniquely versatile platform for spin-based quantum applications, as the desired optical readout wavelength can be chosen to suit the specific requirements.
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by Priya Singh,... at arxiv.org 10-01-2024
https://arxiv.org/pdf/2409.20186.pdfDeeper Inquiries