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Interplay of surface and Dirac plasmons in topological insulators: the case of Bi2Se3 A. Politano, V. M. Silkin, I. A. Nechaev [et.al.]

Contributor(s): Politano, Antonio | Nechaev, Ilya A | Vitiello, Miriam S | Viti, Leonardo | Aliev, Ziya S | Babanly, Mahammad B | Chiarello, G | Echenique, Pedro Miguel | Chulkov, Evgueni V | Silkin, Vyacheslav M | Томский государственный университет Физический факультет Кафедра физики металловMaterial type: ArticleArticleSubject(s): селенид висмута | Дирака фермионы | топологические изоляторыGenre/Form: статьи в журналах Online resources: Click here to access online In: Physical Review Letters Vol. 115, № 21. P. 216802-1-216802-5Abstract: We 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.
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We 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.

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