Withers, F.
Del Pozo-Zamudio, O.
Mishchenko, A.
Rooney, A. P.
Gholinia, A.
Watanabe, K.
Taniguchi, T.
Haigh, S. J.
Geim, A. K.
Tartakovskii, A. I.
Novoselov, K. S.
Article History
Received: 19 November 2014
Accepted: 23 December 2014
First Online: 2 February 2015
Competing interests
: The authors declare no competing financial interests.