Instability of the topological surface state in Bi2Se3 upon deposition of gold

Polyakov, A.; Tusche, C.; Ellguth, M.; Crozier, E. D.; Mohseni, K.; Otrokov, M. M.; Zubizarreta Iriarte, X.; Vergniory, M. G.; Geilhufe, M.; Chulkov, E. V.; Ernst, A.; Meyerheim, H. L.; Parkin, S. S. P.

doi:10.1103/PhysRevB.95.180202

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Instability of the topological surface state in Bi₂Se₃ upon deposition of gold

MPS-Authors

Polyakov, A.
Max Planck Institute of Microstructure Physics, Max Planck Society;

Tusche, C.
Max Planck Institute of Microstructure Physics, Max Planck Society;

Ellguth, M.
Max Planck Institute of Microstructure Physics, Max Planck Society;

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Mohseni, K.
Max Planck Institute of Microstructure Physics, Max Planck Society;

Zubizarreta Iriarte, X.
Max Planck Institute of Microstructure Physics, Max Planck Society;

Vergniory, M. G.
Max Planck Institute of Microstructure Physics, Max Planck Society;

Geilhufe, M.
Max Planck Institute of Microstructure Physics, Max Planck Society;

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Ernst, A.
Max Planck Institute of Microstructure Physics, Max Planck Society;

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Meyerheim, H. L.
Max Planck Institute of Microstructure Physics, Max Planck Society;

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Parkin, S. S. P.
Nano-Systems from Ions, Spins and Electrons, Max Planck Institute of Microstructure Physics, Max Planck Society;

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https://doi.org/10.1103/PhysRevB.95.180202
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Citation

Polyakov, A., Tusche, C., Ellguth, M., Crozier, E. D., Mohseni, K., Otrokov, M. M., et al. (2017). Instability of the topological surface state in Bi₂Se₃ upon deposition of gold. Physical Review B, 95(18): 180202. doi:10.1103/PhysRevB.95.180202.

Cite as: https://hdl.handle.net/21.11116/0000-000A-E3EC-C

Abstract

Momentum-resolved photoemission spectroscopy indicates the instability of the Dirac surface state upon deposition of gold on the (0001) surface of the topological insulator Bi₂Se₃. Based on the structure model derived from extended x-ray absorption fine structure experiments showing that gold atoms substitute bismuth atoms, first-principles calculations provide evidence that a gap appears due to hybridization of the surface state with gold d states near the Fermi level. Our findings provide insights into the mechanisms affecting the stability of the surface state.