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Bulk hexagonal boron nitride (hBN) is a highly nonlinear natural hyperbolicmaterial that attracts major attention in modern nanophotonics applications.However, studies of its optical properties in the visible part of the spectrumand quantum emitters hosted by bulk hBN have not been reported to date. In thiswork we study the emission properties of hBN crystals in the red spectral rangeusing sub-bandgap optical excitation. Quantum emission from defects is observedat room temperature and characterized in detail. Our results advance the use ofhBN in quantum nanophotonics technologies and enhance our fundamentalunderstanding of its optical properties.

Quantum Emission from Defects in Single Crystal Hexagonal Boron Nitride