J. M. Hamm,1,* A. F. Page,1 J. Bravo-Abad,2 F. J. Garcia-Vidal,2,3 and O. Hess1,† 1Blackett Laboratory, Department of Physics, Imperial College London, London SW7 2AZ, United Kingdom 2Departamento de Fı́sica Teórica de la Materia Condensada and Condensed Matter Physics Center (IFIMAC), Universidad Autónoma de Madrid, E-28049 Madrid, Spain 3Donostia International Physics Center (DIPC), E-20018 Do...