Published online by Cambridge University Press: 09 February 2016
Diamond stands out among single-photon sources due to an intrinsically large bandgap, photo-stable emission, room-temperature operation, short excited statelifetimes, and the ability to host hundreds of different color centers.Currently, most of these centers are active in the optical spectrum, but asingle-photon source in the infrared would represent a significant advancement.In pursuit of this end, a number of different transition metal atoms have beenstudied as dopants in the diamond lattice via the GAMESS (General AtomicMolecular and Electronic Structure System) cluster calculation package. Theimportance of cluster size and electron correlation effects is considered, andexcitation energies have been calculated via time-dependent density functionaltheory.