Xu, S. G. http://orcid.org/0000-0002-0589-5291
Berdyugin, A. I. http://orcid.org/0000-0002-7537-6227
Kumaravadivel, P. http://orcid.org/0000-0002-9817-1697
Guinea, F.
Krishna Kumar, R.
Bandurin, D. A.
Morozov, S. V.
Kuang, W.
Tsim, B. http://orcid.org/0000-0002-8567-7488
Liu, S.
Edgar, J. H.
Grigorieva, I. V. http://orcid.org/0000-0001-5991-7778
Fal’ko, V. I. http://orcid.org/0000-0003-0828-0310
Kim, M. http://orcid.org/0000-0001-6304-6901
Geim, A. K. http://orcid.org/0000-0003-2861-8331
Article History
Received: 4 April 2019
Accepted: 12 August 2019
First Online: 5 September 2019
Competing interests
: The authors declare no competing interests.