Dresden 2017 – scientific programme

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DS: Fachverband Dünne Schichten

DS 31: 2D Materials Beyond Graphene III (jointly with O)

DS 31.7: Talk

Wednesday, March 22, 2017, 12:00–12:15, WIL A317

Surface-confined Mott transition in the strongly correlated compound 1T-TaSe₂ — •Florian Diekmann, Christian Sohrt, Kerstin Hanff, Lars-Philip Oloff, Arndt Quer, Matthias Kalläne, and Kai Rossnagel — Institut für Experimentelle und Angewandte Physik, Universität Kiel, 24098 Kiel, Germany

The surface associated modification of the electronic structure of 1T-TaSe₂ in the commensurate charge density-wave (CDW) state is examined by utilising photon energy dependent X-Ray photoemission spectroscopy. In particular, the CDW-induced splitting of the Ta 4f core levels is probed over a wide range of photon energies from 80 eV to 6 keV corresponding to a variation of the information depth from extreme surface to effective bulk sensitivity. The measured depth-dependent core-level splitting corroborates the idea of a surface-confined Mott transition due to a modified CDW at the surface [1,2].

[1] L. Perfetti et al., Phys. Rev. Lett. 90, 166401 (2003).

[2] C. Sohrt et al., Faraday Discuss. 171, 243 (2014).