Magneto-optics of massive Dirac fermions in bulk Bi2Se3

Abstract

We report on magneto-optical studies of Bi2Se3, a representative member of the 3D topological insulator family. Its electronic states in bulk are shown to be well described by a simple Dirac-type Hamiltonian for massive particles with only two parameters: the fundamental bandgap and the band velocity. In a magnetic field, this model implies a unique property - spin splitting equal to twice the cyclotron energy: Es = 2Ec. This explains the extensive magneto-transport studies concluding a fortuitous degeneracy of the spin and orbital split Landau levels in this material. The Es = 2Ec match differentiates the massive Dirac electrons in bulk Bi2Se3 from those in quantum electrodynamics, for which Es = Ec always holds.

5 pages, 3 figures and Supplementary materials, to be published in Physical Review Letters

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• Coexistence of bulk and surface states probed by Shubnikov-de Haas oscillations in Bi${}_2$Se${}_3$ with high charge-carrier density
• Particle-Hole Asymmetry in Gapped Topological Insulator Surface States
• Electronic band structure of Sb2Te3
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• Lattice-matched heterojunctions between topological and normal insulators: A first-principles study
• Thermoelectric transport coefficients of a Dirac electron gas in high magnetic fields
• Effects of self-consistent extended Hubbard interactions and spin-orbit couplings on energy bands of semiconductors and topological insulators
• Ultrahigh magnetic field spectroscopy reveals the band structure of the 3D topological insulator Bi${}_2$Se${}_3$
• Fano q-reversal in topological insulator Bi2Se3
• Ultrafast electronic heat dissipation through surface-to-bulk Coulomb coupling in quantum materials
• Giant and Broadband Circular Dichroism from Particle-Hole Symmetry Breaking in Weyl Semimetals
• Landau level spectroscopy in current solid state physics
• In-Situ Polarimetry in Collimated Magneto-Infrared Spectroscopy System