Spectroscopy and population decay of a van der Waals gap state in layered TiSe2

M. Wiesenmayer, S. Hilgenfeldt, S. Mathias, F. Steeb, T. Rohwer, M. Bauer

Research output: Contribution to journalArticle

Abstract

Two-photon photoemission (2PPE) spectroscopy is used to map the momentum-dependent energy distribution of unoccupied bands in the layered 1T -TiSe2 transition-metal dichalcogenide compound. A comparison of the experimental results with previous calculations based on the local-density functional approach enables us to identify the second Ti3d conduction band and a localized unoccupied state that we assign to the presence of excess titanium atoms in the van der Waals gap of the crystal. Time-resolved 2PPE measurements show clear differences in the lifetime between the two states, indicative for the decoupling of the Ti excess atoms from the bulk electronic structure.

Original languageEnglish (US)
Article number035422
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume82
Issue number3
DOIs
StatePublished - Jul 15 2010
Externally publishedYes

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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