Surface vibrational modes of the topological insulator Bi2Se3 observed by Raman spectroscopy
The result's identifiers
Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216275%3A25310%2F17%3A39910406" target="_blank" >RIV/00216275:25310/17:39910406 - isvavai.cz</a>
Result on the web
<a href="http://dx.doi.org/10.1103/PhysRevB.95.245406" target="_blank" >http://dx.doi.org/10.1103/PhysRevB.95.245406</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1103/PhysRevB.95.245406" target="_blank" >10.1103/PhysRevB.95.245406</a>
Alternative languages
Result language
angličtina
Original language name
Surface vibrational modes of the topological insulator Bi2Se3 observed by Raman spectroscopy
Original language description
We present a polarization resolved Raman scattering study of surface vibration modes in the topological insulator Bi2Se3 single crystal and thick films. Besides the four Raman active bulk phonons, we observed four additional modes with much weaker intensity and slightly lower energy than the bulk counterparts. Using symmetry analysis, we assigned these additional modes to out-of-plane surface phonons. Comparing with first-principle calculations, we conclude that the appearance of these modes is due to c-axis lattice distortion and van der Waals gap expansion near the crystal surface. Two of the surface modes at 60 and 173 cm(-1) are associated with Raman active A(1g) bulk phonon modes, the other two at 136 and 158 cm(-1) are associated with infrared active bulk phonons with A(2u) symmetry. The latter become Raman allowed due to reduction of crystalline symmetry from D-3d in the bulk to C-3v on the crystal surface. In particular, the 158 cm(-1) surface phonon mode shows a Fano line shape under resonant excitation, suggesting interference in the presence of electron-phonon coupling of the surface excitations.
Czech name
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Czech description
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Classification
Type
J<sub>imp</sub> - Article in a specialist periodical, which is included in the Web of Science database
CEP classification
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OECD FORD branch
10302 - Condensed matter physics (including formerly solid state physics, supercond.)
Result continuities
Project
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Continuities
I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace
Others
Publication year
2017
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů
Data specific for result type
Name of the periodical
Physical Review B
ISSN
2469-9950
e-ISSN
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Volume of the periodical
95
Issue of the periodical within the volume
24
Country of publishing house
US - UNITED STATES
Number of pages
9
Pages from-to
"245406-1"-"245406-9"
UT code for WoS article
000402973800007
EID of the result in the Scopus database
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