Yu, G. L.
Gorbachev, R. V.
Tu, J. S.
Kretinin, A. V.
Cao, Y.
Jalil, R.
Withers, F.
Ponomarenko, L. A.
Piot, B. A.
Potemski, M.
Elias, D. C.
Chen, X.
Watanabe, K.
Taniguchi, T.
Grigorieva, I. V.
Novoselov, K. S.
Fal’ko, V. I.
Geim, A. K.
Mishchenko, A.
Article History
Received: 1 February 2014
Accepted: 29 April 2014
First Online: 1 June 2014
Competing interests
: The authors declare no competing financial interests.