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Color centered-based single photon emitters in hexagonal boron nitride (h-BN)have shown promising photophysical properties as sources for quantum lightemission. Despite significant advances towards such a goal, achievinglifetime-limited quantum light emission in h-BN has proven to be challenging,primarily due to various broadening mechanisms including spectral diffusion.Here, we propose and experimentally demonstrate suppression of spectraldiffusion by applying an electrostatic field. We observe both Stark shifttuning of the resonant emission wavelength, and emission linewidth reductionnearly to the homogeneously broadened lifetime limit. Lastly, we find a cubicdependence of the linewidth with respect to temperature at the homogeneousbroadening regime. Our results suggest that field tuning in electrostaticallygated heterostructures is promising as an approach to control the emissioncharacteristics of h-BN color centers, removing spectral diffusion andproviding the energy tunability necessary for integrate of quantum lightemission in nanophotonic architectures.

Lifetime Limited and Tunable Quantum Light Emission in h-BN via Electric Field Modulation