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dc.contributor.authorPisarra, M.
dc.contributor.authorSindona, A.
dc.contributor.authorRiccardi, P.
dc.contributor.authorSilkin, Viatcheslav M.
dc.contributor.authorPitarke de la Torre, José María
dc.date.accessioned2015-11-25T15:15:27Z
dc.date.available2015-11-25T15:15:27Z
dc.date.issued2014-08-04
dc.identifier.citationNew Journal of Physics 16 : (2014) // Article ID 083003es
dc.identifier.issn1367-2630
dc.identifier.urihttp://hdl.handle.net/10810/16185
dc.description.abstractAn acoustic plasmon is predicted to occur, in addition to the conventional two-dimensional (2D) plasmon, as the collective motion of a system of two types of electronic carriers coexisting in the same 2D band of extrinsic (doped or gated) graphene. The origin of this novel mode stems from the anisotropy present in the graphene band structure near the Dirac points K and K'. This anisotropy allows for the coexistence of carriers moving with two distinct Fermi velocities along the Gamma K and Gamma K' directions, which leads to two modes of collective oscillation: one mode in which the two types of carriers oscillate in phase with one another (this is the conventional 2D graphene plasmon, which at long wavelengths (q -> 0) has the same dispersion, q(1/2), as the conventional 2D plasmon of a 2D free electron gas), and the other mode found here corresponds to a low-frequency acoustic oscillation (whose energy exhibits at long-wavelengths a linear dependence on the 2D wavenumber q) in which the two types of carriers oscillate out of phase. This prediction represents a realization of acoustices
dc.description.sponsorshipMP acknowledges the financial support of MIUR (FIRB-Futuro in Ricerca 2010-Project PLASMOGRAPH grant no. RBFR10M5BT), the European Commission, the European Social Fund and Regione Calabria, (POR) Calabria-FSE 2007/2013. VMS acknowledges financial support from the Spanish MICINN (no. FIS2010-19609-C02-01), the Departamento de Educacion del Gobierno Vasco, and the University of the Basque Country (no. GIC07-IT-36607).es
dc.language.isoenges
dc.publisherIOP Publishinges
dc.rightsinfo:eu-repo/semantics/openAccesses
dc.subjectgraphenees
dc.subjecttime dependent DFTes
dc.subjectplasmonses
dc.subjectlinear response theoryes
dc.subjectsurface-plasmones
dc.subjectmetal-surfaceses
dc.subjectCU(111)es
dc.subjectexcitationes
dc.subjectsystemses
dc.titleAcoustic plasmons in extrinsic free-standing graphenees
dc.typeinfo:eu-repo/semantics/articlees
dc.rights.holder© 2014 IOP Publishing Ltd and Deutsche Physikalische Gesellschaft. Content from this work may be used under the terms of the Creative Commons Attribution 3.0 licence. Any further distribution of this work must maintain attribution to the author(s) and the title of the work, journal citation and DOI.es
dc.relation.publisherversionhttp://iopscience.iop.org/article/10.1088/1367-2630/16/8/083003/meta;jsessionid=D70A041729C5F85045EFD48BD159BDD2.c3.iopscience.cld.iop.org#artAbstes
dc.identifier.doi10.1088/1367-2630/16/8/083003
dc.departamentoesFísica de materialeses_ES
dc.departamentoesFísica de la materia condensadaes_ES
dc.departamentoeuMaterialen fisikaes_ES
dc.departamentoeuMateria kondentsatuaren fisikaes_ES
dc.subject.categoriaPHYSICS AND ASTRONOMY


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