Chen Xiao-Chun, Li Hong-Min, Fang Fei, Wu Yuan-Wei, Wang Mu, Ma Guo-Bin, Ma Yu-Qiang, Shu Da-Jun, Peng Ru-Wen
National Laboratory of Solid State Microstructures & Department of Physics, Nanjing University, Nanjing 210093, China.
Adv Mater. 2012 May 15;24(19):2637-41. doi: 10.1002/adma.201200089. Epub 2012 Apr 12.