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

doi:10.1103/PhysRevLett.115.216802

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DOI Доступ к ресурсу на сайте издателя				10.1103/PhysRevLett.115.216802

Title: Interplay of surface and Dirac plasmons in topological insulators: the case of Bi2Se3
Creator: Politano, Antonio
Creator: Nechaev, Ilya A.
Creator: Vitiello, Miriam S.
Creator: Viti, Leonardo
Creator: Aliev, Ziya S.
Creator: Babanly, Mahammad B.
Creator: Chiarello, G.
Creator: Echenique, Pedro Miguel
Creator: Chulkov, Evgueni V.
Creator: Silkin, V. M.
Contributor: Томский государственный университет Физический факультет Кафедра физики металлов
Subject: селенид висмута
Дирака фермионы
топологические изоляторы
Date: 2015
DOI: 10.1103/PhysRevLett.115.216802
Description: 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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collection(s): Физический факультет
Identifier: vtls:000533210
http://vital.lib.tsu.ru/vital/access/manager/Repository/vtls:000533210
Type: статьи в журналах
Source: Physical Review Letters. 2015. Vol. 115, № 21. P. 216802-1-216802-5
Language: eng

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Физический факультет Interplay of surface and Dirac plasmons in topological insulators: the case of Bi2Se3