Abstract
We have studied the energy dependence of the electron-phonon coupling strength on Bi(100). A fit of the temperature-dependent surface state linewidth results in a change of the coupling parameter from to as the binding energy of the surface state increases from 70 to 330 meV. This result cannot be reconciled with the usual interpretation of as the electron-phonon mass enhancement parameter at the Fermi energy. We suggest that this behavior is mainly caused by the strong energy dependence of the bulk density of states in this region.
- Received 23 April 2003
DOI:https://doi.org/10.1103/PhysRevLett.91.127601
©2003 American Physical Society