Magneto-Infrared Spectroscopic Study of Ultrathin Bi${}_2$Te${}_3$ Single Crystals

Abstract

Ultrathin Bi${}_2$Te${}_3$ single crystals laid on Scotch tape are investigated by Fourier transform infrared spectroscopy at $4$K and in a magnetic field up to $35$T. The magneto-transmittance spectra of the Bi${}_2$% Te${}_3$/tape composite are analyzed as a two-layer system and the optical conductivity of Bi${}_2$Te${}_3$ at different magnetic fields are extracted. We find that magnetic field modifies the optical conductivity in the following ways: (1) Field-induced transfer of the optical weight from the lower frequency regime ($<250$cm${}^{-1}$) to the higher frequency regime (cm${}^{-1}$) due to the redistribution of charge carriers across the Fermi surface. (2) Evolving of a Fano-resonance-like spectral feature from an anti-resonance to a resonance with increasing magnetic field. Such behavior can be attributed to the electron-phonon interactions between the optical phonon mode and the continuum of electronic transitions. (3) Cyclotron resonance resulting from the inter-valence band Landau level transitions, which can be described by the electrodynamics of massive Dirac holes.

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Cited by in corpus (5)

• Landau level spectroscopy of massive Dirac fermions in single-crystalline ZrTe5 thin flakes
• Electron-Hole Asymmetry of Surface States in Topological Insulator Sb2Te3 Thin Films Revealed by Magneto-Infrared Spectroscopy
• Bulk cyclotron resonance in the topological insulator Bi2Te3
• Particle-hole asymmetry and quantum confinement effects on the magneto-optical response of topological insulator thin-films
• Observation of cyclotron antiresonance in the topological insulator Bi2Te3