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

M. Wiesenmayer, Sascha 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

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Spectroscopy
Transition metal compounds
Atoms
metal compounds
decay
Photoelectron spectroscopy
Titanium
Conduction bands
decoupling
spectroscopy
Electronic structure
atoms
Momentum
energy distribution
conduction bands
photoelectric emission
Photons
titanium
transition metals
electronic structure

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

Cite this

Spectroscopy and population decay of a van der Waals gap state in layered TiSe2. / Wiesenmayer, M.; Hilgenfeldt, Sascha; Mathias, S.; Steeb, F.; Rohwer, T.; Bauer, M.

In: Physical Review B - Condensed Matter and Materials Physics, Vol. 82, No. 3, 035422, 15.07.2010.

Research output: Contribution to journalArticle

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