T.G.R. acknowledges the support from the Newton Fund and the Royal Society (UK) through the Newton Advanced Fellowship scheme (Ref. No. NA150043), T.P.C., A.R.R., and T.G.R. thank the Brazilian Agency… Click to show full abstract
T.G.R. acknowledges the support from the Newton Fund and the Royal Society (UK) through the Newton Advanced Fellowship scheme (Ref. No. NA150043), T.P.C., A.R.R., and T.G.R. thank the Brazilian Agency CNPq for financial support. J.H.G. acknowledges the Severo Ochoa Program (MINECO, Grant No. SEV-2013-0295), the Spanish Ministry of Economy and Competitiveness (Grant No. MAT2012-33911), the Secretaria de Universidades e Investigacion del Departamento de Economia y Conocimiento de la Generalidad de Cataluna, and the European Union Seventh Framework Programme under Grant Agreement No. 604391 Graphene Flagship.
               
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