Helical fluctuations in the Raman response of the topological insulator Bi2Se3

Details Helical fluctuations in the Raman response of the topological insulator Bi2Se3 Helical fluctuations in the Raman response of the topological insulator Bi2Se3

2011-08-09

arxiv.org/abs/1108.2047v2

Physics

Condensed Matter

Strongly Correlated Electrons

12 pages, 5 figures, 1 table

Scientific paper

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

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