skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: Surface phonons in the topological insulators Bi 2Se 3 and Bi 2Te 3

Abstract

Raman scattering, inelastic helium scattering and photoemission experiments on the topological insulators Bi 2Se 3 and Bi 2Te 3 show features in the range ~ 50–160 cm -1, which have been assigned alternatively to Raman-forbidden, bulk infrared modes arising from symmetry breaking at the surface or to surface phonons, which couple to the topologically protected electronic states. Here, we present temperature- and wavelength- dependent Raman studies showing additional modes we ascribe to surface phonons in both Bi 2Se 3 and Bi 2Te 3. Our assignment is supported by density functional theory calculations revealing surface phonons at frequencies close to those of the extra peaks in the Raman data. The theoretical results also indicate that these modes are not a consequence of spin-orbit coupling and, thus, that their occurrence is unrelated to the topological properties of these materials.

Authors:
Publication Date:
Research Org.:
Lawrence Berkeley National Laboratory-National Energy Research Scientific Computing Center
Sponsoring Org.:
USDOE Office of Science (SC)
OSTI Identifier:
1479000
DOE Contract Number:  
AC02-05CH11231
Resource Type:
Journal Article
Journal Name:
Solid State Communications
Additional Journal Information:
Journal Volume: 271; Journal Issue: C; Journal ID: ISSN 0038-1098
Publisher:
Elsevier
Country of Publication:
United States
Language:
English

Citation Formats

None, None. Surface phonons in the topological insulators Bi2Se3 and Bi2Te3. United States: N. p., 2018. Web. doi:10.1016/j.ssc.2017.12.012.
None, None. Surface phonons in the topological insulators Bi2Se3 and Bi2Te3. United States. doi:10.1016/j.ssc.2017.12.012.
None, None. Thu . "Surface phonons in the topological insulators Bi2Se3 and Bi2Te3". United States. doi:10.1016/j.ssc.2017.12.012.
@article{osti_1479000,
title = {Surface phonons in the topological insulators Bi2Se3 and Bi2Te3},
author = {None, None},
abstractNote = {Raman scattering, inelastic helium scattering and photoemission experiments on the topological insulators Bi2Se3 and Bi2Te3 show features in the range ~ 50–160 cm-1, which have been assigned alternatively to Raman-forbidden, bulk infrared modes arising from symmetry breaking at the surface or to surface phonons, which couple to the topologically protected electronic states. Here, we present temperature- and wavelength- dependent Raman studies showing additional modes we ascribe to surface phonons in both Bi2Se3 and Bi2Te3. Our assignment is supported by density functional theory calculations revealing surface phonons at frequencies close to those of the extra peaks in the Raman data. The theoretical results also indicate that these modes are not a consequence of spin-orbit coupling and, thus, that their occurrence is unrelated to the topological properties of these materials.},
doi = {10.1016/j.ssc.2017.12.012},
journal = {Solid State Communications},
issn = {0038-1098},
number = C,
volume = 271,
place = {United States},
year = {2018},
month = {3}
}