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Take a look at our latest Nano Letters article about the optical conductivity of two-dimensional silicon epitaxially grown on sapphire where we bring evidence of a Dirac electrodynamics in collaboration with Stefano Lupi (Univ. Rome La Sapienza), Olivia Pulci (Univ. Rome Tor Vergata), Paola Gori (Univ. Rome 3), and TEM guys at the ST-Microelectronics Agrate. If you want to know more, go through the 2D activity at the CNR-IMM and the ERC-COG XFab project, and keep in touch with Alessandro Molle and Carlo Grazianetti