Quantum coherence of image-potential states |
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Authors: | Wahl P Schneider M A Diekhöner L Vogelgesang R Kern K |
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Affiliation: | Max-Planck-Institut für Festk?rperforschung, Heisenbergstrasse 1, D-70569 Stuttgart, Germany. |
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Abstract: | The quantum dynamics of the two-dimensional image-potential states in front of the Cu(100) surface is measured by scanning tunneling microscopy and spectroscopy. The dispersion relation and the momentum resolved phase-relaxation time of the first image-potential state are determined from the quantum interference patterns in the local density of states at step edges. It is demonstrated that the tip-induced Stark shift does not affect the motion of the electrons parallel to the surface. |
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