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dc.contributor.authorAbedinpour, Saeed H.eng
dc.contributor.authorVignale, Giovanni, 1957-eng
dc.contributor.authorPrincipi, A.eng
dc.contributor.authorPolini, Marcoeng
dc.contributor.authorTse, Wang-Kongeng
dc.contributor.authorMacDonald, A. H.eng
dc.date.issued2011eng
dc.descriptionhttp://arxiv.org/PS_cache/arxiv/pdf/1101/1101.4291v1.pdfeng
dc.description.abstractWe demonstrate that the plasmon frequency and Drude weight of the electron liquid in a doped graphene sheet are strongly renormalized by electron-electron interactions even in the long-wavelength limit. This e ffect is not captured by the Random Phase Approximation (RPA), commonly used to describe electron fluids and is due to coupling between the center of mass motion and the pseudospin degree of freedom of the graphene's massless Dirac fermions. Making use of diagrammatic perturbation theory to rst order in the electron-electron interaction, we show that this coupling enhances both the plasmon frequency and the Drude weight relative to the RPA value. We also show that interactions are responsible for a signi cant enhancement of the optical conductivity at frequencies just above the absorption threshold. Our predictions can be checked by far-infrared spectroscopy or inelastic light scattering.eng
dc.description.sponsorshipS.H.A. and G.V. acknowledge support from NSF Grant No. 0705460. M.P. acknowledges nancial support by the 2009/2010 CNR-CSIC scienti c cooperation project. Work in Austin was supported by the Welch Foundation and by SWAN. S.H.A. acknowledges support and the kind hospitality of the IPM in Tehran, Iran, during the nal stages of this work.eng
dc.identifier.citationarXiv:1101.4291v1eng
dc.identifier.urihttp://hdl.handle.net/10355/10016eng
dc.languageEnglisheng
dc.publisherarXiveng
dc.relation.ispartofcollectionUniversity of Missouri--Columbia. College of Arts and Sciences. Department of Physics and Astronomy. Physics and Astronomy publicationseng
dc.subject.lcshNanoscienceeng
dc.subject.lcshCondensed mattereng
dc.titleDrude weight, plasmon dispersion, and a.c. conductivity in doped graphene sheetseng
dc.typeArticleeng


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