Repositorio Institucional de la Universidad de Oviedo

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We thank C. Crespo for technical assistance with the THz laser. R.H., P.A-G. and A.N. acknowledge support from the Spanish Ministry of Economy and Competitiveness (national projects MAT2015-65525-R, FIS2014-60195-JIN and MAT2014-53432-05-4-R, respectively). F.H.L.K. acknowledges support from the Fundacio Cellex Barcelona, the ERC Career integration grant (294056, GRANOP), the ERC starting grant (307806, CarbonLight), the Government of Catalonia through the SGR grant (2014-SGR-1535), the Mineco grants Ramon y Cajal (RYC-2012-12281) and Plan Nacional (FIS2013-47161-P) and project GRASP (FP7-ICT-2013-613024-GRASP). R.H., F.H.L.K., A.P. and M.P. acknowledge support by the EC under the Graphene Flagship (contract no. CNECT-ICT-604391). Y.G. and J.H. acknowledge support from the US Office of Naval Research (N00014-13-1-0662).