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Interplay of surface and Dirac plasmons in topological insulators: The case of Bi2Se3

AuthorsPolitano, A.; Silkin, Viatcheslav M.; Nechaev, I. A.; Aliev, Ziya S.; Chiarello, G.; Echenique, Pedro M. ; Chulkov, Eugene V.
Issue Date2015
PublisherAmerican Physical Society
CitationPhysical Review Letters 115(21): 216802 (2015)
AbstractWe have investigated plasmonic excitations at the surface of Bi2Se3(0001) via high-resolution electron energy loss spectroscopy. For low parallel momentum transfer q≥, the loss spectrum shows a distinctive feature peaked at 104 meV. This mode varies weakly with q≥. The behavior of its intensity as a function of primary energy and scattering angle indicates that it is a surface plasmon. At larger momenta (q≥∼0.04 Å-1), an additional peak, attributed to the Dirac plasmon, becomes clearly defined in the loss spectrum. Momentum-resolved loss spectra provide evidence of the mutual interaction between the surface plasmon and the Dirac plasmon of Bi2Se3. The proposed theoretical model accounting for the coexistence of three-dimensional doping electrons and two-dimensional Dirac fermions accurately represents the experimental observations. The results reveal novel routes for engineering plasmonic devices based on topological insulators.
DescriptionUnder the terms of the Creative Commons Attribution License 3.0 (CC-BY).-- et al.
Publisher version (URL)http://dx.doi.org/10.1103/PhysRevLett.115.216802
Identifiersdoi: 10.1103/PhysRevLett.115.216802
issn: 0031-9007
e-issn: 1079-7114
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