Quantum-well states above the Fermi energy in thin Yb(111)-metal films deposited on a W(110) single crystal were studied by low-temperature scanning tunneling spectroscopy. These states are laterally highly localized and give rise to sharp peaks in the tunneling spectra. A quantitative analysis of the spectra yields the bulk-band dispersion in Gamma - L direction as well as quasi-particle lifetimes. The quadratic energy dependence of the lifetimes is in quantitative agreement with Fermi-liquid theory.
@article{arxiv.cond-mat/0411580,
title = {Electronic Structure and Dynamics of Quantum-Well States in thin Yb-Metal Films},
author = {D. Wegner and A. Bauer and G. Kaindl},
journal= {arXiv preprint arXiv:cond-mat/0411580},
year = {2009}
}
Comments
4 pages, 4 figures; Submitted to PRL; Version 2: introduction revised and references added