Volkov-Pankratov states in topological heterojunctions
Physical Review B
American Physical Society (APS)
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Tchoumakov, S., Jouffrey, V., Inhofer, A., Bocquillon, E., Plaçais, B., Carpentier, D., & Goerbig, M. (2017). Volkov-Pankratov states in topological heterojunctions. Physical Review B, 96 (20) https://doi.org/10.1103/PhysRevB.96.201302
We show that a smooth interface between two insulators of opposite topological Z2 indices possesses multiple surface states, both massless and massive. While the massless surface state is non-degenerate, chiral and insensitive to the interface potential, the massive surface states only appear for a sufficiently smooth heterojunction. The surface states are particle-hole symmetric and a voltage drop reveals their intrinsic relativistic nature, similarly to Landau bands of Dirac electrons in a magnetic field. We discuss the relevance of the massive Dirac surface states in recent ARPES and transport experiments.
External DOI: https://doi.org/10.1103/PhysRevB.96.201302
This record's URL: https://www.repository.cam.ac.uk/handle/1810/290067