Fano q-reversal in topological insulator Bi2Se3. (22nd March 2016)

• Record Type: Journal Article
• Authors: Dordevic, S V; Foster, G M; Wolf, M S; Stojilovic, N; Lei, H; Petrovic, C; Chen, Z; Li, Z Q; Tung, L C
• Is Part Of: Journal of physics. Volume 28:Number 16(2016)
• Publication Date: 2016-03-22
• Subjects: Bi2Se3 -- topological insulators -- optical spectroscopy -- magneto-optical spectroscopy; Condensed matter -- Periodicals; Matière condensée -- Périodiques; Vaste stoffen; Vloeistoffen; Natuurkunde; Electronic journals; Computer network resources; 530.4105
• DOI: 10.1088/0953-8984/28/16/165602
• Languages: English
• ISSNs: 0953-8984

Abstract

Abstract: We studied the magneto-optical response of a canonical topological insulator Bi2 Se3 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.