Phys.org February 11, 2022
Spins in two-dimensional materials offer an advantage, as the reduced dimensionality enables feasible on-chip integration into devices. An international team of researchers (UK, Australia) has reported room-temperature optically detected magnetic resonance (ODMR) from single carbon-related defects in hexagonal boron nitride with up to 100 times stronger contrast than the ensemble average. They identified two distinct bunching timescales in the second-order intensity-correlation measurements for ODMR-active defects, but only one for those without an ODMR response. They observed either positive or negative ODMR signal for each defect. Based on kinematic models, they related this bipolarity to highly tunable internal optical rates. They resolved an ODMR fine structure in the form of an angle-dependent doublet resonance, indicative of weak but finite zero-field splitting. According to the researchers the finding could eventually support scalable quantum networks built from two-dimensional materials that can operate at room temperature…read more. Open Access TECHNICAL ARTICLEÂ
Optical properties of single and ensemble hBN defects. Credit: Nature Communications volume 13, Article number: 618 (2022)Â