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dc.contributor.authorBezares, FJ
dc.contributor.authorSanctis, AD
dc.contributor.authorSaavedra, JRM
dc.contributor.authorWoessner, A
dc.contributor.authorAlonso-González, P
dc.contributor.authorAmenabar, I
dc.contributor.authorChen, J
dc.contributor.authorBointon, TH
dc.contributor.authorDai, S
dc.contributor.authorFogler, MM
dc.contributor.authorBasov, DN
dc.contributor.authorHillenbrand, R
dc.contributor.authorCraciun, MF
dc.contributor.authorGarcía de Abajo, FJ
dc.contributor.authorRusso, S
dc.contributor.authorKoppens, FHL
dc.date.accessioned2017-09-21T10:07:21Z
dc.date.issued2017-08-15
dc.description.abstractAs a two-dimensional semimetal, graphene offers clear advantages for plasmonic applications over conventional metals, such as stronger optical field confinement, in situ tunability, and relatively low intrinsic losses. However, the operational frequencies at which plasmons can be excited in graphene are limited by the Fermi energy EF, which in practice can be controlled electrostatically only up to a few tenths of an electronvolt. Higher Fermi energies open the door to novel plasmonic devices with unprecedented capabilities, particularly at mid-infrared and shorter-wave infrared frequencies. In addition, this grants us a better understanding of the interaction physics of intrinsic graphene phonons with graphene plasmons. Here, we present FeCl3-intercalated graphene as a new plasmonic material with high stability under environmental conditions and carrier concentrations corresponding to EF > 1 eV. Near-field imaging of this highly doped form of graphene allows us to characterize plasmons, including their corresponding lifetimes, over a broad frequency range. For bilayer graphene, in contrast to the monolayer system, a phonon-induced dipole moment results in increased plasmon damping around the intrinsic phonon frequency. Strong coupling between intrinsic graphene phonons and plasmons is found, supported by ab initio calculations of the coupling strength, which are in good agreement with the experimental data.en_GB
dc.description.sponsorshipFJGA and PA-G acknowledge support from the Spanish Ministry of Economy and Competitiveness through the national programs MAT2014-59096-P and FIS2014-60195-JIN, respectively. MFC and SR acknowledge support from EPSRC (Grant no. EP/J000396/1, 281 EP/K017160/1, EP/K010050/1, EPG036101/1, EP/M001024/1, EPM- 002438/1), from Royal Society International Exchanges Scheme 2012/R3 and 2013/R2 and from European Commission (FP7-ICT-2013-613024-GRASP). SD, DNB and MF acknowledge support of ONR N00014-15-1-2671. DNB is the Moore Investigator in Quantum Materials funded by the Gordon and Betty Moore Foundation’s EPiQS Initiative through Grant GBMF4533.en_GB
dc.identifier.citationPublished online 15 August 2017en_GB
dc.identifier.doi10.1021/acs.nanolett.7b01603
dc.identifier.urihttp://hdl.handle.net/10871/29457
dc.language.isoenen_GB
dc.publisherAmerican Chemical Societyen_GB
dc.rights.embargoreasonPublisher policyen_GB
dc.subject2D intercalationen_GB
dc.subjectGraphene plasmonsen_GB
dc.subjectelectron−phonon interactionsen_GB
dc.subjecthighly doped grapheneen_GB
dc.subjects-SNOMen_GB
dc.titleIntrinsic Plasmon-Phonon Interactions in Highly Doped Graphene: A Near-Field Imaging Study.en_GB
dc.typeArticleen_GB
dc.identifier.issn1530-6984
exeter.place-of-publicationUnited Statesen_GB
dc.descriptionAuthor's accepted versionen_GB
dc.descriptionFinal version available from ACS via the DOI in this recorden_GB
dc.identifier.eissn1530-6992
dc.identifier.journalNano Lettersen_GB
dc.identifier.pmid28809573


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