Surface Phonons in the Topological Insulators Bi2Se3 and Bi2Te3
arXiv:1709.05330 · doi:10.1016/j.ssc.2017.12.012
Abstract
Raman scattering [K. M. F. Shahil et al., Appl. Phys. Lett. 96, 153103 (2010), V. Gnezdilov et al., Phys. Rev. B 84, 195118 (2011) and H. H. Kung et al., Phys. Rev. B 95, 245406 (2017)], inelastic helium scattering [X. Zhu et al., Phys. Rev. Lett. 107, 186102 (2011)] and photoemission experiments [J. A. Sobota et al., Phys. Rev. Lett. 113, 157401 (2014)] 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.
arXiv comment17 pages, 3 figures
References in corpus (21)
- Quantum ESPRESSO: a modular and open-source software project for quantum simulations of materials
- Topological Insulators
- Phonons and related properties of extended systems from density-functional perturbation theory
- First observation of Spin-Momentum Helical Locking in Bi2Se3 and Bi2Te3, demonstration of Topological-Order at 300K and a realization of topological-transport-regime
- Crossover of Three-Dimensional Topological Insulator of Bi2Se3 to the Two-Dimensional Limit
- Spintronics and Pseudospintronics in Graphene and Topological Insulators
- Topological Surface States Protected From Backscattering by Chiral Spin Texture
- Optical characterization of BiSe in a magnetic field: infrared evidence for magnetoelectric coupling in a topological insulator material
- Topological insulators for high performance terahertz to infrared applications
- Crystal Symmetry Breaking in Few-Quintuple Bismuth Telluride Films: Applications in Nanometrology of Topological Insulators
- Mechanically-Exfoliated Stacks of Thin Films of Bismuth Telluride Topological Insulators with Enhanced Thermoelectric Performance
- Strong nonlinear terahertz response induced by Dirac surface states in Bi2Se3 Topological Insulator
- First Principles Investigations of the Atomic, Electronic, and Thermoelectric Properties of Equilibrium and Strained Bi2Se3 & Bi2Te3, with van der Waals Interactions
- Quasiparticle Effects in the Bulk and Surface-State Bands of Bi2Se3 and Bi2Te3 Topological Insulators
- Distinguishing bulk and surface electron-phonon coupling in the topological insulator Bi2Se3 using time-resolved photoemission spectroscopy
- Interaction of Phonons and Dirac Fermions on the Surface of Bi2Se3: A Strong Kohn Anomaly
- Helical fluctuations in the Raman response of the topological insulator Bi2Se3
- Surface vibrational modes of the topological insulator BiSe observed by Raman spectroscopy
- Electron-phonon interaction on the surface of a 3D topological insulator
- Anomalous behavior in the phonon dispersion of the (001) surface of BiTe determined from helium atom-surface scattering measurements
- Plasmon-enhanced electron-phonon coupling in Dirac surface states of the thin-film topological insulator Bi2Se3
Cited by in corpus (5)
- Vibrational Spectra of Pb2Bi2Te3, PbBi2Te4 and PbBi4Te7 Topological Insulators: Temperature Dependent Raman and Theoretical Insight from DFT Simulations
- THz Surface Modes and Electron-Phonon Coupling in BiSe(111)
- Influence of local symmetry on lattice dynamics coupled to topological surface states
- Electronic and Vibrational Excitations on the Surface of the Three-Dimensional Topological Insulator BiTeSe (x = 0, 2, 3)
- Evidence for atomic-scale vibron-mediated electron bunching