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Title: Fano q-reversal in topological insulator Bi 2Se 3

Here, we studied the magneto-optical response of a canonical topological insulator Bi 2Se 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.
;  [1] ;  [2] ;  [2] ;  [3] ;  [1] ;  [4] ;  [4] ;  [5]
  1. Brookhaven National Lab. (BNL), Upton, NY (United States)
  2. Univ. of Akron, Akron, OH (United States)
  3. Univ. of Wisconsin Oshkosh, Oshkosh, WI (United States)
  4. National High Magnetic Field Lab., Tallahassee, FL (United States)
  5. Univ. of North Dakota, Grand Forks, ND (United States); National High Magnetic Field Lab., Tallahassee, FL (United States)
Publication Date:
Report Number(s):
Journal ID: ISSN 0953-8984; R&D Project: PM016; KC0201050
Grant/Contract Number:
Accepted Manuscript
Journal Name:
Journal of Physics. Condensed Matter
Additional Journal Information:
Journal Volume: 28; Journal Issue: 16; Journal ID: ISSN 0953-8984
IOP Publishing
Research Org:
Brookhaven National Laboratory (BNL), Upton, NY (United States)
Sponsoring Org:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
Country of Publication:
United States
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; Bi2Se3; topological insulators; optical spectroscopy; magneto-optical spectroscopy
OSTI Identifier: