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Measuring topological invariants in a polaritonic analog of graphene Real, Bastian Dauphin, Alexandre Massignan, Pietro Alberto Sagnes, Isabelle Jamadi, Omar Milicevic, Marijane Lemaitre, Aristide Harouri, Abdelmounaim Le Gratiet, Luc Ravets, Sylvain Bloch, Jaqueline Amo, Alberto Universitat Politècnica de Catalunya. Departament de Física Universitat Politècnica de Catalunya. SIMCON - First-principles approaches to condensed matter physics: quantum effects and complexity Àrees temàtiques de la UPC::Matemàtiques i estadística::Topologia Graphene Graphene Grafè Topological materials rely on engineering global properties of their bulk energy bands called topo- logical invariants. These invariants, usually defined over the entire Brillouin zone, are related to the existence of protected edge states. However, for an important class of Hamiltonians correspond- ing to 2D lattices with time-reversal and chiral symmetry (e.g. graphene), the existence of edge states is linked to invariants that are not defined over the full 2D Brillouin zone, but on reduced 1D sub-spaces Postprint (published version) 2021-03-25 Article Real, B. [et al.]. Measuring topological invariants in a polaritonic analog of graphene. "Physical review letters", 25 Març 2021, vol. 126, núm. 127403, p. 1-11. 1079-7114 https://hdl.handle.net/2117/364011 10.1103/PhysRevLett.126.127403 eng https://journals.aps.org/prl/abstract/10.1103/PhysRevLett.126.127403 http://creativecommons.org/licenses/by-nc-nd/3.0/es/ Open Access Attribution-NonCommercial-NoDerivs 3.0 Spain 11 p. application/pdf American Institute of Physics (AIP)