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.

doi:10.1103/PhysRevB.97.085424

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

MPS-Authors

Widdra, W.
Max Planck Institute of Microstructure Physics, Max Planck Society;

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https://doi.org/10.1103/PhysRevB.97.085424
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Citation

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.

Cite as: https://hdl.handle.net/21.11116/0000-0009-28C0-1

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.