000095375 001__ 95375 000095375 005__ 20210902121833.0 000095375 0247_ $$2doi$$a10.1103/PhysRevLett.124.257401 000095375 0248_ $$2sideral$$a119181 000095375 037__ $$aART-2020-119181 000095375 041__ $$aeng 000095375 100__ $$aBrey, L. 000095375 245__ $$aNonlocal Quantum Effects in Plasmons of Graphene Superlattices 000095375 260__ $$c2020 000095375 5060_ $$aAccess copy available to the general public$$fUnrestricted 000095375 5203_ $$aBy using a nonlocal, quantum mechanical response function we study graphene plasmons in a one-dimensional superlattice (SL) potential V0cosG0x. The SL introduces a quantum energy scale EG~vFG0 associated with electronic subband transitions. At energies lower than EG, the plasmon dispersion is highly anisotropic; plasmons propagate perpendicularly to the SL axis, but become damped by electronic transitions along the SL direction. These results question the validity of semiclassical approximations for describing low energy plasmons in periodic structures. At higher energies, the dispersion becomes isotropic and Drude-like with effective Drude weights related to the average of the absolute value of the local chemical potential. Full quantum mechanical treatment of the kinetic energy thus introduces nonlocal effects that delocalize the plasmons in the SL, making the system behave as a metamaterial even near singular points where the charge density vanishes. 000095375 536__ $$9info:eu-repo/grantAgreement/ES/DGA/Q-MAD$$9info:eu-repo/grantAgreement/ES/MINECO/FIS2017-82260-P$$9info:eu-repo/grantAgreement/ES/MINECO/MAT2017-88358-C3-1-R$$9info:eu-repo/grantAgreement/ES/MINECO/MDM-2014-0377$$9info:eu-repo/grantAgreement/ES/MINECO/PGC2018-096955-B-C42$$9info:eu-repo/grantAgreement/ES/MINECO/PGC2018-097018-B-I00 000095375 540__ $$9info:eu-repo/semantics/openAccess$$aAll rights reserved$$uhttp://www.europeana.eu/rights/rr-f/ 000095375 590__ $$a9.161$$b2020 000095375 591__ $$aPHYSICS, MULTIDISCIPLINARY$$b7 / 85 = 0.082$$c2020$$dQ1$$eT1 000095375 592__ $$a3.688$$b2020 000095375 593__ $$aPhysics and Astronomy (miscellaneous)$$c2020$$dQ1 000095375 655_4 $$ainfo:eu-repo/semantics/article$$vinfo:eu-repo/semantics/publishedVersion 000095375 700__ $$aStauber, T. 000095375 700__ $$0(orcid)0000-0001-9273-8165$$aMartín-Moreno, L.$$uUniversidad de Zaragoza 000095375 700__ $$aGómez-Santos, G. 000095375 7102_ $$12003$$2395$$aUniversidad de Zaragoza$$bDpto. Física Materia Condensa.$$cÁrea Física Materia Condensada 000095375 773__ $$g124, 25 (2020), 257401 [6 pp.]$$pPhys. rev. lett.$$tPhysical Review Letters$$x0031-9007 000095375 8564_ $$s926551$$uhttps://zaguan.unizar.es/record/95375/files/texto_completo.pdf$$yVersión publicada 000095375 8564_ $$s21409$$uhttps://zaguan.unizar.es/record/95375/files/texto_completo.jpg?subformat=icon$$xicon$$yVersión publicada 000095375 909CO $$ooai:zaguan.unizar.es:95375$$particulos$$pdriver 000095375 951__ $$a2021-09-02-10:17:53 000095375 980__ $$aARTICLE