Coexistence of bulk and surface states probed by Shubnikov-de Haas oscillations in Bi${}_2$Se${}_3$ with high charge-carrier density

Abstract

Topological insulators are ideally represented as having an insulating bulk with topologically protected, spin-textured surface states. However, it is increasingly becoming clear that these surface transport channels can be accompanied by a finite conducting bulk, as well as additional topologically trivial surface states. To investigate these parallel conduction transport channels, we studied Shubnikov-de Haas oscillations in Bi${}_2$Se${}_3$ thin films, in high magnetic fields up to 30 T so as to access channels with a lower mobility. We identify a clear Zeeman-split bulk contribution to the oscillations from a comparison between the charge-carrier densities extracted from the magnetoresistance and the oscillations. Furthermore, our analyses indicate the presence of a two-dimensional state and signatures of additional states the origin of which cannot be conclusively determined. Our findings underpin the necessity of theoretical studies on the origin of and the interplay between these parallel conduction channels for a careful analysis of the material's performance.

Manuscript including supplemental material

References in corpus (15)

• Discovery (theoretical prediction and experimental observation) of a large-gap topological-insulator class with spin-polarized single-Dirac-cone on the surface
• Topological Surface States Protected From Backscattering by Chiral Spin Texture
• Coexistence of the topological state and a two-dimensional electron gas on the surface of Bi2Se3
• Bulk Fermi surface coexistence with Dirac surface state in Bi${}_2$Se${}_3$: a comparison of photoemission and Shubnikov-de Haas measurements
• Strong surface scattering in ultrahigh mobility Bi2Se3 topological insulator crystals
• Emergent quantum confinement at topological insulator surfaces
• Momentum-Resolved Landau-Level Spectroscopy of Dirac Surface State in Bi2Se3
• Epitaxial growth of topological insulator Bi2Se3 film on Si(111) with atomically sharp interface
• Emergence of decoupled surface transport channels in bulk insulating Bi2Se3 thin films
• Magneto-optics of massive Dirac fermions in bulk Bi2Se3
• Anisotropic and strong negative magneto-resistance in the three-dimensional topological insulator Bi2Se3
• Shubnikov-de Haas oscillations from topological surface states of metallic Bi${}_2$Se${}_{2.1}$Te${}_{0.9}$
• Restoring Pristine Bi2Se3 Surface with an Effective Se Decapping Process
• Role of Se vacancies on Shubnikov de Haas oscillations in Bi2Se3: a combined magneto-resistance and positron annihilation study
• Disorder-driven topological phase transition in Bi2Se3 films

Cited by in corpus (1)

• Observation of multichannel quantum coherent transport and electron-electron interaction in Bi2Te3 single crystal