Discovery of ST2 centers in natural and CVD diamond
Jonas Foglszinger·Jörg Wrachtrup·Roman Kolesov·G. V. Astakhov·M. Schreck·Petr Siyushev·Lev Kazak·A.M. Zaitsev·Fedor Jelezko·Andrej Denisenko·Jens Fuhrmann
Abstract The ST2 center is an optically addressable point defect in diamond that facilitates spin initialization and readout at room temperature. However, while this study presents the discovery of photostable ST2 centers first observed in a natural diamond and provides a reliable technique for artificially creating them, its chemical structure remains unknown. To assess the potential of ST2, we map out its basic optical characteristics, reveal its electronic level structure, and quantify the in