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  Image potential states at transition metal oxide surfaces: A time-resolved two-photon photoemission study on ultrathin NiO films

Gillmeister, K., Kiel, M., & Widdra, W. (2018). Image potential states at transition metal oxide surfaces: A time-resolved two-photon photoemission study on ultrathin NiO films. Physical Review B, 97(8): 085424. doi:10.1103/PhysRevB.97.085424.

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Item Permalink: https://hdl.handle.net/21.11116/0000-0009-28C0-1 Version Permalink: https://hdl.handle.net/21.11116/0000-0009-4EFC-5
Genre: Journal Article

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PhysRevB.97.085424.pdf (Publisher version), 3MB
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https://doi.org/10.1103/PhysRevB.97.085424 (Publisher version)
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Gillmeister, K.1, Author
Kiel, M.1, Author
Widdra, W.2, Author
Affiliations:
1External Organizations, ou_persistent22              
2Max Planck Institute of Microstructure Physics, Max Planck Society, Weinberg 2, 06120 Halle, DE, ou_2415691              

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 Abstract: For well-ordered ultrathin films of NiO(001) on Ag(001), a series of unoccupied states below the vacuum level has been found. The states show a nearly free electron dispersion and binding energies which are typical for image potential states. By time-resolved two-photon photoemission (2PPE), the lifetimes of the first three states and their dependence on oxide film thickness are determined. For NiO film thicknesses between 2 and 4 monolayers (ML), the lifetime of the first state is in the range of 28–42 fs and shows an oscillatory behavior with increasing thickness. The values for the second state decrease monotonically from 88 fs for 2 ML to 33 fs for 4 ML. These differences are discussed in terms of coupling of the unoccupied states to the layer-dependent electronic structure of the growing NiO film.

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 Dates: 2018-02-162018-02-15
 Publication Status: Issued
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 Identifiers: BibTex Citekey: P13708
DOI: 10.1103/PhysRevB.97.085424
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Title: Physical Review B
  Abbreviation : Phys. Rev. B
Source Genre: Journal
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Publ. Info: Woodbury, NY : American Physical Society
Pages: - Volume / Issue: 97 (8) Sequence Number: 085424 Start / End Page: - Identifier: ISSN: 1098-0121
CoNE: https://pure.mpg.de/cone/journals/resource/954925225008