Helical fluctuations in the Raman response of the topological insulator Bi2Se3

Abstract

The topological insulator Bi2Se3 shows a Raman scattering response related to topologically protected surface states amplified by a resonant interband transition. Most significantly this signal has a characteristic Lorentzian lineshape and spin-helical symmetry due to collision dominated scattering of Dirac states at the Fermi level E_F on bulk valence states. Its resonance energy, temperature and doping dependence points to a high selectivity of this process. Its scattering rate (Gamma=40 cm-1=5 meV) is comparable to earlier observations, e.g. in spin-polaron systems. Although the observation of topological surface states in Raman scattering is limited to resonance conditions, this study represents a quite clean case which is not polluted by symmetry forbidden contributions from the bulk

12 pages, 5 figures, 1 table

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Cited by in corpus (18)

• Ultrafast photocurrents at the surface of the three-dimensional topological insulator ${\mathrm{Bi}}_2{\mathrm{Se}}_3$
• Enhancement of bulk photovoltaic effect in topological insulators
• Turning a Band Insulator Into an Exotic Superconductor
• Surface vibrational modes of the topological insulator Bi${}_2$Se${}_3$ observed by Raman spectroscopy
• Phonon spectrum and bonding properties of Bi${}_2$Se${}_3$: Role of strong spin-orbit interaction
• Thickness tunable quantum interference between surface phonon and Dirac plasmon states in thin-films of the topological insulator Bi2Se3
• Local phonon mode in thermoelectric Bi2Te2Se from charge neutral antisites
• Detecting band inversions by measuring the environment: fingerprints of electronic band topology in bulk phonon linewidths
• Plasmon-enhanced electron-phonon coupling in Dirac surface states of the thin-film topological insulator Bi2Se3
• Raman Spectroscopy of Bi2Se3-xTex (x= 0 to 3) Topological Insulator Crystals
• Surface Phonons in the Topological Insulators Bi2Se3 and Bi2Te3
• Evidence for singular-phonon-induced nematic superconductivity in a topological superconductor candidate Sr${}_{0.1}$Bi${}_2$Se${}_3$
• Pressure-induced phase transition in Bi${}_2$Se${}_3$ at 3 GPa: electronic topological transition or not?
• Enhanced quasiparticle dynamics of quantum well states: the giant Rashba system BiTeI and topological insulators
• Effect of topology on quasi-particle interactions in the Weyl semimetal WP${}_2$
• Softened magnetic excitations in the s = 3/2 distorted triangular antiferromagnet alpha-CaCr2O4
• Vibrational Properties of the Bi2Se3 Orthorhombic Metastable Phase
• Non-trivial phonon dynamics and significant electron-phonon coupling of the high frequency modes in a Dirac semimetal