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

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arxiv 1809.03248 v1 pith:2FP4IKJG submitted 2018-09-10 cond-mat.mtrl-sci

A. Polyakov , C. Tusche , M. Ellguth , E. D. Crozier , K. Mohseni , M. M. Otrokov , X. Zubizarreta , M. G. Vergniory
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M. Geilhufe E. V. Chulkov A. Ernst H. L. Meyerheim S. S. P. Parkin
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classification cond-mat.mtrl-sci
keywords surfacegoldstateatomsdepositioninstabilitystructuretopological
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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.

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