Interplay of surface and Dirac plasmons in topological insulators

The case of Bi2Se3

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

Research output: Contribution to journalArticle

38 Citations (Scopus)

Abstract

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.

Original languageEnglish
Article number216802
JournalPhysical Review Letters
Volume115
Issue number21
DOIs
Publication statusPublished - 18 Nov 2015
Externally publishedYes

Fingerprint

plasmons
insulators
momentum
momentum transfer
energy dissipation
fermions
routes
engineering
electron energy
high resolution
scattering
spectroscopy
excitation
electrons
interactions
energy

ASJC Scopus subject areas

  • Physics and Astronomy(all)

Cite this

Politano, A., Silkin, V. M., Nechaev, I. A., Vitiello, M. S., Viti, L., Aliev, Z. S., ... Chulkov, E. V. (2015). Interplay of surface and Dirac plasmons in topological insulators: The case of Bi2Se3. Physical Review Letters, 115(21), [216802]. https://doi.org/10.1103/PhysRevLett.115.216802

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

In: Physical Review Letters, Vol. 115, No. 21, 216802, 18.11.2015.

Research output: Contribution to journalArticle

Politano, A, Silkin, VM, Nechaev, IA, Vitiello, MS, Viti, L, Aliev, ZS, Babanly, MB, Chiarello, G, Echenique, PM & Chulkov, EV 2015, 'Interplay of surface and Dirac plasmons in topological insulators: The case of Bi2Se3', Physical Review Letters, vol. 115, no. 21, 216802. https://doi.org/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. / Interplay of surface and Dirac plasmons in topological insulators : The case of Bi2Se3. In: Physical Review Letters. 2015 ; Vol. 115, No. 21.
@article{6f287629fd27416cac5ea5916edeaea6,
title = "Interplay of surface and Dirac plasmons in topological insulators: The case of Bi2Se3",
abstract = "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 {\AA}-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.",
author = "A. Politano and Silkin, {V. M.} and Nechaev, {I. A.} and Vitiello, {M. S.} and L. Viti and Aliev, {Z. S.} and Babanly, {M. B.} and G. Chiarello and Echenique, {P. M.} and Chulkov, {E. V.}",
year = "2015",
month = "11",
day = "18",
doi = "10.1103/PhysRevLett.115.216802",
language = "English",
volume = "115",
journal = "Physical Review Letters",
issn = "0031-9007",
publisher = "American Physical Society",
number = "21",

}

TY - JOUR

T1 - Interplay of surface and Dirac plasmons in topological insulators

T2 - The case of Bi2Se3

AU - Politano, A.

AU - Silkin, V. M.

AU - Nechaev, I. A.

AU - Vitiello, M. S.

AU - Viti, L.

AU - Aliev, Z. S.

AU - Babanly, M. B.

AU - Chiarello, G.

AU - Echenique, P. M.

AU - Chulkov, E. V.

PY - 2015/11/18

Y1 - 2015/11/18

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.

AB - 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://www.scopus.com/inward/record.url?scp=84948427948&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=84948427948&partnerID=8YFLogxK

U2 - 10.1103/PhysRevLett.115.216802

DO - 10.1103/PhysRevLett.115.216802

M3 - Article

VL - 115

JO - Physical Review Letters

JF - Physical Review Letters

SN - 0031-9007

IS - 21

M1 - 216802

ER -