Quantum description of the optical response of charged monolayer-thick metallic patch nanoantennas

J.A. and M.Z. acknowledge support from the Spanish Ministry of Economy and Competitiveness MINECO through project FIS2016-80174-P, as well as support from NIST Grant No. 70NANB15H32 of the US Department of Commerce. A.K.K acknowledges financial support from the project FIS2016-76617-P of MINECO. M.Z. also acknowledges the hospitality of the Institute des Sciences Moleculaires d’Orsay.