Feng, Jiandong
Graf, Michael
Liu, Ke
Ovchinnikov, Dmitry
Dumcenco, Dumitru
Heiranian, Mohammad
Nandigana, Vishal
Aluru, Narayana R.
Kis, Andras
Radenovic, Aleksandra
Article History
Received: 6 December 2015
Accepted: 13 May 2016
First Online: 13 July 2016
Competing interests
: The authors declare no competing financial interests.