Yan, Feng
Zhang, Xiuwen
Yu, Yonggang G.
Yu, Liping
Nagaraja, Arpun
Mason, Thomas O.
Zunger, Alex
Article History
Received: 12 November 2014
Accepted: 27 April 2015
First Online: 24 June 2015
Competing interests
: The authors declare no competing financial interests.