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Studying charge density wave systems and THz collective excitations with a meV atomic beam

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Helium atom scattering (HAS) provides access to the low-energy meV region of surface vibrational modes and allows to study subtle effects such as the influence of van der Waals bonding. The ability of HAS to observe charge density waves (CDWs) – periodic modulations of the electron density – will be discussed. Examples include multivalley CDWs in Sb(111) and a CDW phase-transition in the one-dimensional topological metal Bi(114). Moreover, the experimental dispersion curves of the topological insulator Bi2Se3 reveal two additional branches, suggesting the presence of surface plasmons in the THz region.

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

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