1. Fanoq-reversal in topological insulator Bi2Se3
- Author
-
Nenad Stojilovic, M. S. Wolf, G. M. Foster, Z. G. Chen, Li-Chun Tung, Z.Q. Li, Sasa Dordevic, Hechang Lei, and Cedomir Petrovic
- Subjects
Phonon ,media_common.quotation_subject ,Cyclotron resonance ,FOS: Physical sciences ,02 engineering and technology ,Fano plane ,01 natural sciences ,Asymmetry ,Condensed Matter - Strongly Correlated Electrons ,Mesoscale and Nanoscale Physics (cond-mat.mes-hall) ,0103 physical sciences ,General Materials Science ,010306 general physics ,media_common ,Physics ,Strongly Correlated Electrons (cond-mat.str-el) ,Condensed Matter - Mesoscale and Nanoscale Physics ,Condensed matter physics ,Degenerate energy levels ,Condensed Matter::Mesoscopic Systems and Quantum Hall Effect ,021001 nanoscience & nanotechnology ,Condensed Matter Physics ,Magnetic field ,Coupling (physics) ,Topological insulator ,0210 nano-technology - 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.
- Published
- 2016