Band structure of Bi surfaces formed on Bi2Se3 upon exposure to air

Abstract

Bi${}_2$Se${}_3$ has been the focus of intense interest over the past decade due to its topological properties. Bi surfaces are known to form on Bi${}_2$Se${}_3$ upon exposure to atmosphere, but their electronic structure has not been investigated. We report band structure measurements of such Bi surfaces using angle-resolved photoemission spectroscopy. Measured spectra can be well explained by the band structure of a single bilayer of Bi on Bi${}_2$Se${}_3$, and show that Bi surfaces consistently dominate the photoemission signal for air exposure times of at least 1 hour. These results demonstrate that atmospheric effects should be taken into consideration when identifying two-dimensional transport channels, and when designing surface-sensitive measurements of Bi${}_2$Se${}_3$, ideally limiting air exposure to no more than a few minutes.

References in corpus (13)

• Discovery (theoretical prediction and experimental observation) of a large-gap topological-insulator class with spin-polarized single-Dirac-cone on the surface
• Two-dimensional Dirac fermions in a topological insulator: transport in the quantum limit
• Topological origin of subgap conductance in insulating bilayer graphene
• Bulk Fermi surface coexistence with Dirac surface state in Bi${}_2$Se${}_3$: a comparison of photoemission and Shubnikov-de Haas measurements
• Rapid Surface Oxidation as a Source of Surface Degradation Factor for Bi2Se3
• Nonlinear optical probe of tunable surface electrons on a topological insulator
• Spatially resolved femtosecond pump-probe study of topological insulator Bi2Se3
• Ultrafast carrier and phonon dynamics in Bi2Se3 crystals
• Quasiparticle Dynamics in Reshaped Helical Dirac Cone of Topological Insulators
• Experimental setup for low-energy laser-based angle resolved photoemission spectroscopy
• Tuning time and energy resolution in time-resolved photoemission spectroscopy with nonlinear crystals
• Work function of bulk-insulating topological insulator Bi2-xSbxTe3-ySey
• Intra- and Interband Electron Scattering in the Complex Hybrid Topological Insulator Bismuth Bilayer on Bi${}_2$Se${}_3$

Cited by in corpus (1)

• Detecting the full photoemission cone from laser-based ARPES experiments by leveraging deflector technology