Intra- and Interband Electron Scattering in the Complex Hybrid Topological Insulator Bismuth Bilayer on Bi${}_2$Se${}_3$

Abstract

The band structure, intra- and interband scattering processes of the electrons at the surface of a bismuth-bilayer on Bi${}_2$Se${}_3$ have been experimentally investigated by low-temperature Fourier-transform scanning tunneling spectroscopy. The observed complex quasiparticle interference patterns are compared to a simulation based on the spin-dependent joint density of states approach using the surface-localized spectral function calculated from first principles as the only input. Thereby, the origin of the quasiparticle interferences can be traced back to intraband scattering in the bismuth bilayer valence band and Bi${}_2$Se${}_3$ conduction band, and to interband scattering between the two-dimensional topological state and the bismuth-bilayer valence band. The investigation reveals that the bilayer band gap, which is predicted to host one-dimensional topological states at the edges of the bilayer, is pushed several hundred milli-electronvolts above the Fermi level. This result is rationalized by an electron transfer from the bilayer to Bi${}_2$Se${}_3$ which also leads to a two-dimensional electron state in the Bi${}_2$Se${}_3$ conduction band with a strong Rashba spin-splitting, coexisting with the topological state and bilayer valence band.

arXiv comment11 pages, 5 figures

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• Absence of superconductivity in ultra-thin layers of FeSe synthesized on a topological insulator
• Odd-Parity Quasiparticle Interference in the Superconductive Surface State of UTe2
• Mesoscopic electron focusing in topological insulators
• Electronic Structure of Fe${}_{1.08}$Te bulk crystals and epitaxial FeTe thin films on Bi${}_2$Te${}_3$
• Enhanced spin ordering temperature in ultrathin FeTe films grown on a topological insulator
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• Band structure of Bi surfaces formed on Bi2Se3 upon exposure to air
• Domain imaging across the magneto-structural phase transition in Fe${}_{1+y}$Te