PHYSICAL REVIEW B 100, 155419 (2019) Blue-light-emitting color centers in high-quality hexagonal boron nitride

Brian Shevitski ,1,2,3,4 S. Matt Gilbert,1,2,3 Christopher T. Chen,4 Christoph Kastl,4,5 Edward S. Barnard,4 Ed Wong,4 D. Frank Ogletree,4 Kenji Watanabe,6 Takashi Taniguchi,6 Alex Zettl,1,2,3,* and Shaul Aloni4,† 1Department of Physics, University of California at Berkeley, Berkeley, California 94720, USA 2Materials Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA 3Kavli Energy NanoScience Institute at the University of California, Berkeley, and the Lawrence Berkeley National Laboratory, Berkeley, California 94729, USA 4The Molecular Foundry, Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA 5Walter-Schottky-Institute and Physik Department, Technical University of Munich, 85748 Garching, Germany 6Advanced Materials Laboratory, National Institute for Materials Science, 1-1 Namiki, Tsukuba 305-0044, Japan