This article was originally published online on 2 April 2018 with an incorrect affiliation for the fourth author. It is correct as it appears above. All online versions were corrected on 6 April 2018; the article is correct as it appears in the print version of the journal. a) Current address: CNR-IMM, via C. Olivetti 2, 20864 Agrate Brianza,(MB), Italy.
AIP Publishing LLC
14 May 2018
Volume: 112 Issue: 20 Pages: 209901
Applied Physics Letters