Instability of the topological surface state in Bi${}_2$Se${}_3$ upon deposition of gold

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 Bi${}_2$Se${}_3$. 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 new insights into the mechanisms affecting the stability of the surface state.

arXiv comment6 pages, 4 figures

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Cited by in corpus (3)

• Spectroscopic realization of large surface gap in a doped magnetic topological insulator
• Single-Hemisphere Photoelectron Momentum Microscope With Time-of-Flight Recording
• Growth, Morphology and Stability of Au in Contact with the Bi2Se3(0001) Surface