Scientific Reports 5: Article number:10459; published online: 21 May 2015; updated: 23 February 2016

This Article contains a typographical error in a grant number in the Acknowledgements section.

“This work was supported by the NSF of China (Grant Nos 11234005, 51332001, 51221291, and 51472140), and the NSF (Grant No: DMR-1410714, DMR-0820404, and DMR-1210588).”

should read:

“This work was supported by the NSF of China (Grant Nos. 11234005, 51332001, 51221291, and 51472140), and the NSF (Grant No: DMR-1410714, DMR1420620, and DMR-1210588).”