Ni, G. X.
Wang, L. http://orcid.org/0000-0002-1919-9107
Goldflam, M. D.
Wagner, M.
Fei, Z. http://orcid.org/0000-0002-0009-0507
McLeod, A. S.
Liu, M. K.
Keilmann, F. http://orcid.org/0000-0001-8334-2310
Özyilmaz, B.
Castro Neto, A. H.
Hone, J.
Fogler, M. M.
Basov, D. N.
Article History
Received: 20 October 2015
Accepted: 17 February 2016
First Online: 28 March 2016
Competing interests
: F.K. is one of the cofounders of Neaspec, producer of the s-SNOM apparatus used in this study.