Optically induced dynamic nuclear spin polarisation in diamond oleh Jochen Scheuer, Ilai Schwartz, Qiong Chen, David Schulze-Sünninghausen, Patrick Carl, Peter Höfer, Alexander Retzker, Hitoshi Sumiya, Junichi Isoya, Burkhard Luy, Martin B Plenio, Boris Naydenov, Fedor Jelezko