He Yu, Yu Xiqian, Wang Yanhong, Li Hong, Huang Xuejie
Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing, 100190, China.
Adv Mater. 2011 Nov 9;23(42):4938-41. doi: 10.1002/adma.201102568. Epub 2011 Sep 26.