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Fano q-reversal in topological insulator Bi2Se3

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.

preprint2016arXivOpen access
S. V. DordevicG. M. FosterM. S. WolfN. StojilovicH. LeiC. PetrovicZ. ChenZ. Q. LiL. C. Tung
cond-mat.mes-hallcond-mat.str-el
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S. V. DordevicG. M. FosterM. S. WolfN. StojilovicH. LeiC. PetrovicZ. ChenZ. Q. LiL. C. Tung

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