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Politano A, Silkin VM, Nechaev IA, et al. Interplay of Surface and Dirac Plasmons in Topological Insulators: The Case of Bi_{2}Se_{3}. Phys Rev Lett. 2015;115(21):216802doi: 10.1103/PhysRevLett.115.216802.
Politano, A., Silkin, V. M., Nechaev, I. A., Vitiello, M. S., Viti, L., Aliev, Z. S., Babanly, M. B., Chiarello, G., Echenique, P. M., & Chulkov, E. V. (2015). Interplay of Surface and Dirac Plasmons in Topological Insulators: The Case of Bi_{2}Se_{3}. Physical review letters, 115(21), 216802. https://doi.org/10.1103/PhysRevLett.115.216802
Politano, A, et al. "Interplay of Surface and Dirac Plasmons in Topological Insulators: The Case of Bi_{2}Se_{3}." Physical review letters vol. 115,21 (2015): 216802. doi: https://doi.org/10.1103/PhysRevLett.115.216802
Politano A, Silkin VM, Nechaev IA, Vitiello MS, Viti L, Aliev ZS, Babanly MB, Chiarello G, Echenique PM, Chulkov EV. Interplay of Surface and Dirac Plasmons in Topological Insulators: The Case of Bi_{2}Se_{3}. Phys Rev Lett. 2015 Nov 20;115(21):216802. doi: 10.1103/PhysRevLett.115.216802. Epub 2015 Nov 18. PMID: 26636863.
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Phys Rev Lett. 2015 Nov 20;115(21):216802. doi: 10.1103/PhysRevLett.115.216802. Epub 2015 Nov 18.

Interplay of Surface and Dirac Plasmons in Topological Insulators: The Case of Bi_{2}Se_{3}.

Physical review letters

A Politano, V M Silkin, I A Nechaev, M S Vitiello, L Viti, Z S Aliev, M B Babanly, G Chiarello, P M Echenique, E V Chulkov

Affiliations

  1. Department of Physics, University of Calabria, 87036 Rende (CS), Italy.
  2. Donostia International Physics Center (DIPC), Paseo de Manuel Lardizabal 4, 20018 San Sebastián/Donostia, Spain.
  3. Departamento de Física de Materiales, Universidad del País Vasco, Apartado 1072, 20080 San Sebastián/Donostia, Spain.
  4. IKERBASQUE, Basque Foundation for Science, 48011 Bilbao, Spain.
  5. Tomsk State University, 634050 Tomsk, Russian Federation.
  6. Saint Petersburg State University, 198504 Saint Petersburg, Russian Federation.
  7. NEST, Istituto Nanoscienze-CNR and Scuola Normale Superiore, Piazza San Silvestro 12, 56127 Pisa, Italy.
  8. Institute of Catalysis and Inorganic Chemistry, ANAS, AZ1143 Baku, Azerbaijian.
  9. Institute of Physics, ANAS, AZ1143 Baku, Azerbaijian.
  10. CNISM, Consorzio Nazionale Interuniversitario per le Scienze Fisiche della Materia, Via della Vasca Navale, 84, 00146 Roma, Italy.
  11. Centro de Física de Materiales CFM-Materials Physics Center MPC, Centro Mixto CSIC-UPV/EHU, Paseo de Manuel Lardizabal 5, 20018 San Sebastián/Donostia, Spain.

PMID: 26636863 DOI: 10.1103/PhysRevLett.115.216802

Abstract

We have investigated plasmonic excitations at the surface of Bi_{2}Se_{3}(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 Bi_{2}Se_{3}. 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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