Chin. Phys. Lett.  2002, Vol. 19 Issue (8): 1195-1198    DOI:
Original Articles |
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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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.
Keywords: 78.47.+p      78.20.Bh      68.43.Tj     
Published: 01 August 2002
PACS:  78.47.+p  
  78.20.Bh (Theory, models, and numerical simulation)  
  68.43.Tj (Photon stimulated desorption)  
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https://cpl.iphy.ac.cn/       OR      https://cpl.iphy.ac.cn/Y2002/V19/I8/01195
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