Repositorio Institucional de la Universidad de Oviedo

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We gratefully acknowledge financial support from the VILLUM FONDEN via the Centre of Excellence for Dirac Materials (Grant No. 11744) and VILLUM project grant no. 13264 (J.V.L.). Y.-X.Y. was supported by the U.S. Department of Energy, Office of Science, Basic Energy Sciences, as part of the Computational Materi- als Science Program. C.E.S. received support from the European Community’s Seventh Framework Programme (FP7/2007-2013) CALIPSO under grant agreement no 312284.