Optically addressable spin defects hosted in two-dimensional van der Waals materials represent a new frontier for quantum technologies, promising to lead to a new class of ultrathin quantum sensors and simulators. Recently, hexagonal boron nitride (hBN) has been shown to host several types of optically addressable spin defects, thus offering a unique opportunity to utilise various spin species in a single material. Here we demonstrate the co-existence of two separate spin species within a single hBN powder sample, namely boron vacancy defects and visible emitter spins. To identify the two spin species, we studied photoluminescence (PL) and optically detected magnetic resonance (ODMR) spectra for the as-received commercially sourced hBN powder and after electron irradiation. Further, we prepared a film of hBN powder on a test magnetic sample (a patterned CoFeB film with in-plane magnetization) and used the hBN spins to spatially map the sample’s stray magnetic field at room temperature.Our results establish hBN as a versatile platform for quantum technologies in a van der Waals host at room temperature.
The nitrogen-vacancy (NV) centre in diamond is a perfect candidate for quantum sensing applications applied to numerous fields of science. Past studies improved the sensitivity of diamonds containing NV centres by increasing their density or prolonging their coherence time. However, few studies discussed the effects of other defects inside the diamond crystal on the sensitivity of the NV centres. In this study, we demonstrated the implication of single substitutional nitrogen defects on the fluorescence emission, charge state stability, coherence time and sensitivity of the NV centres. We found that there is an optimal concentration of nitrogen defects that allows diamond samples to have a high-density of NV centres and high fluorescence without significantly affecting the coherence time. This results will inform the correct choice of diamond characteristics for current and future quantum sensing applications with the NV centres.
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