TY  - SER
AU  - Politano,Antonio
AU  - Nechaev,Ilya A.
AU  - Vitiello,Miriam S.
AU  - Viti,Leonardo
AU  - Aliev,Ziya S.
AU  - Babanly,Mahammad B.
AU  - Chiarello,G.
AU  - Echenique,Pedro Miguel
AU  - Chulkov,Evgueni V.
AU  - Silkin,Vyacheslav M.
ED  - Томский государственный университет
TI  - Interplay of surface and Dirac plasmons in topological insulators: the case of Bi2Se3
KW  - селенид висмута
KW  - Дирака фермионы
KW  - топологические изоляторы
KW  - статьи в журналах
N1  - Библиогр.: 37 назв
N2  - 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
UR  - http://vital.lib.tsu.ru/vital/access/manager/Repository/vtls:000533210
ER  -