Physical mechanisms for the unique optical properties of chalcogen-hyperdoped silicon Hezhu Shao, Yuan Li, Jinhu Zhang, Bo-Yuan Ning, Wenxian Zhang, Xi-Jing Ning, Li Zhao and Jun Zhuang EPL, 99 4 (2012) 46005 Published online: 31 August 2012 DOI: 10.1209/0295-5075/99/46005