Fano q-reversal in topological insulator Bi2Se3

S. V. Dordevic; G. M. Foster; M. S. Wolf; N. Stojilovic; H. Lei; C. Petrovic; Z. Chen; Z. Q. Li; L. C. Tung

doi:10.1088/0953-8984/28/16/165602

Fano q-reversal in topological insulator Bi2Se3

Strongly Correlated Electrons 2016-10-12 v1 Mesoscale and Nanoscale Physics

Authors: S. V. Dordevic , G. M. Foster , M. S. Wolf , N. Stojilovic , H. Lei , C. Petrovic , Z. Chen , Z. Q. Li , L. C. Tung

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Abstract

We studied magneto-optical response of a canonical topological insulator Bi $_2$ Se $_3$ with the goal of addressing a controversial issue of electron-phonon coupling. Magnetic-field induced modifications of reflectance are very pronounced in the infrared part of the spectrum, indicating strong electron-phonon coupling. This coupling causes an asymmetric line-shape of the 60 cm $^{-1}$ phonon mode, and is analyzed within the Fano formalism. The analysis reveals that the Fano asymmetry parameter (q) changes sign when the cyclotron resonance is degenerate with the phonon mode. To the best of our knowledge this is the first example of magnetic field driven q-reversal.

Keywords

topological insulator Bi2Se3 magneto-optical response electron-phonon coupling Fano resonance q-reversal cyclotron resonance

Cite

@article{arxiv.1610.02012,
  title  = {Fano q-reversal in topological insulator Bi2Se3},
  author = {S. V. Dordevic and G. M. Foster and M. S. Wolf and N. Stojilovic and H. Lei and C. Petrovic and Z. Chen and Z. Q. Li and L. C. Tung},
  journal= {arXiv preprint arXiv:1610.02012},
  year   = {2016}
}

Fano q-reversal in topological insulator Bi2Se3

Abstract

Keywords

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