Dielectric screening and plasmon resonances in bilayer graphene
| Autor: | M. Pisarra, A. Sindona, José María Pitarke, Viatcheslav M. Silkin, Mario Gravina |
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| Přispěvatelé: | Regione Calabria, European Commission, Universidad del País Vasco, Eusko Jaurlaritza, Ministerio de Economía y Competitividad (España), UAM. Departamento de Química |
| Rok vydání: | 2016 |
| Předmět: |
Materials science
Dielectric screening Ab initio Physics::Optics Order (ring theory) Química 02 engineering and technology Time-dependent density functional theory Electron 021001 nanoscience & nanotechnology 01 natural sciences Molecular physics Bilayer graphene 0103 physical sciences Monolayer Physics::Atomic and Molecular Clusters Plasmon resonances 010306 general physics 0210 nano-technology Ground state Plasmon |
| Zdroj: | Digital.CSIC: Repositorio Institucional del CSIC Consejo Superior de Investigaciones Científicas (CSIC) Digital.CSIC. Repositorio Institucional del CSIC instname Biblos-e Archivo. Repositorio Institucional de la UAM |
| DOI: | 10.1103/PhysRevB.93.035440 |
| Popis: | The plasmon structure of intrinsic and extrinsic bilayer graphene is investigated in the framework of ab initio time-dependent density-functional theory (TDDFT) at the level of the random-phase approximation (RPA). A two-step scheme is adopted, where the electronic ground state of a periodically repeated slab of bilayer graphene is first determined with full inclusion of the anisotropic band structure and the interlayer interaction; a Dyson-like equation is then solved self-consistently in order to calculate the so-called density-response function of the many-electron system. A two-dimensional correction is subsequently applied in order to eliminate the artificial interaction between the replicas. The energy range below ∼30 eV is explored, focusing on the spectrum of single-particle excitations and plasmon resonances induced by external electrons or photons. The high-energy loss features of the π and σ+π plasmons, particularly their anisotropic dispersions, are predicted and discussed in relation with previous calculations and experiments performed on monolayer and bilayer graphene. At the low-energy end, the energy-loss function is found to be (i) very sensitive to the injected charge carrier density in doped bilayer graphene and (ii) highly anisotropic. Furthermore, various plasmon modes are predicted to exist and are analyzed with reference to the design of novel nanodevices. M.P. and M.G. acknowledge financial support by the European Commission, the European Social Fund, and the Regione Calabria, (POR) Calabria - FSE 2007/2013, and the hospitality of CIC nanoGUNE and the Donostia International Physics Center (DIPC). V.M.S. acknowledges the partial support from the Basque Departamento de Educacion, UPV/EHU (Grant No. IT-756-13) and the Spanish Ministry of Economy and Competitiveness MINECO (Grant No. FIS2013-48286-C2-1-P). |
| Databáze: | OpenAIRE |
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