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Coherence and Decoherence of a Localized Excitation on a
Surface Adatom |
| GAO Shi-Wu1;H. Petek2;J. Aizpurua1;P. Apell1 |
| 1Department of Applied Physics, Chalmers and Göteborg
University, SE-412 96 Göteborg, Sweden
2Department of Physics and Astronomy, University of Pittsburgh, Pittsburgh, PA 15260, USA |
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| Cite this article: |
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GAO Shi-Wu, H. Petek, J. Aizpurua et al 2002 Chin. Phys. Lett. 19 1195-1198 |
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Abstract A theory of coherent excitation of a localized state on an adatom by two-photon photoemission spectroscopy (TR-2PPE) is presented within a microscopic model and the time-dependent formalism. Coherent oscillation and incoherent population decay of the excitation are obtained, and are shown to attain well-defined lifetime constants only in the long-delay limit. In addition, we have found a competing excitation channel via electron transfer. The theory is applied to Cs/Cu (111), which reproduces a few qualitative features observed in recent experiments. The effect of atomic motion on the 2PPE spectra, which manifests dominantly as a redshift in the spectrum, has been analysed.
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| Keywords:
78.47.+p
78.20.Bh
68.43.Tj
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Published: 01 August 2002
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