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Investigating pnictogen surfaces via HAS: The effect of electron-hole excitations on measured vibronic modes

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The surface properties of the pnictogens bismuth (Bi) and antimony (Sb) have been of great interest to the development of the newly found material class of topological insulators. As has recently been shown by the group of El-Batanouny in Boston, the vibronic structure of topological materials as measured by helium atom scattering is heavily influenced by its special surface electronic structure. Since these electronic peculiarities are already present in its base materials Bi and Sb, it is not surprising that their surface vibronic properties are anomalous as well. Elastic and inelastic helium scattering results as well as their theoretical interpretation will be presented and discussed.

This talk is part of the Surfaces, Microstructure and Fracture Group series.

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