Optically Active Spin Defects in Few-Layer Thick Hexagonal Boron Nitride

A. Durand, T. Clua-Provost, F. Fabre, P. Kumar, J. Li, J. H. Edgar, P. Udvarhelyi, A. Gali, X. Marie, C. Robert, J. M. Gérard, B. Gil, G. Cassabois, and V. Jacques