Lu, H.
Lipatov, A.
Ryu, S.
Kim, D. J.
Lee, H.
Zhuravlev, M. Y.
Eom, C. B.
Tsymbal, E. Y.
Sinitskii, A.
Gruverman, A.
Article History
Received: 15 September 2014
Accepted: 8 October 2014
First Online: 24 November 2014
Competing interests
: The authors declare no competing financial interests.