Physics

Quantum dot

Resonance (particle physics)

Nanotechnology

Optics

Atomic physics

Photon

Materials science

Condensed matter physics

Spins

Graphene

Boron nitride

Molecular physics

Spin (aerodynamics)

Hexagonal boron nitride

Optoelectronics

Thermodynamics

Nature Communications

Optically addressable spins in materials are important platforms for quantum technologies, such as repeaters and sensors. Identification of such systems in two-dimensional (2d) layered materials offers advantages over their bulk counterparts, as their reduced dimensionality enables more feasible on-chip integration into devices. Here, we report optically detected magnetic resonance (ODMR) from previously identified carbon-related defects in 2d hexagonal boron nitride (hBN). We show that single-defect ODMR contrast can be as strong as 6% and displays a magnetic-field dependence with both positive or negative sign per defect. This bipolarity can shed light into low contrast reported recently for ensemble ODMR measurements for these defects. Further, the ODMR lineshape comprises a doublet resonance, suggesting either low zero-field splitting or hyperfine coupling. Our results offer a promising route towards realising a room-temperature spin-photon quantum interface in hexagonal boron nitride.

Room-temperature optically detected magnetic resonance of single defects in hexagonal boron nitride