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Surface-state linewidth from scanning tunnelling spectroscopy |
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| Authors: | R Berndt J Li WD Schneider S Crampin |
| Institution: | (1) 2. Physikalisches Institut, RWTH Aachen, D-52056 Aachen, Germany (E-mail: richard.berndt@physik.rwth-aachen.de), DE;(2) Institut de la Matière Condensée, Université de Lausanne, CH-1015 Lausanne, Switzerland, CH;(3) Department of Physics, University of Bath, BA2 7AY, United Kingdom, UK |
| Abstract: | The STM can be used to investigate lifetimes of hot holes in a surface state at low temperatures. We analysed dI/dV data from Ag(111) using detailed tunnelling calculations and a simple model and found an electron self-energy of Σ=4.9±0.6 meV. The corresponding lifetime τ= 67±8 fs is considerably higher than those determined by angle-resolved photoemission, although it remains below theoretical predictions. Spatially resolved dI/dV spectra reveal that the lifetime decreases drastically in proximity to defects such as surface steps. Received: 22 March 1999 / Accepted: 25 June 1999 / Published online: 16 September 1999 |
| Keywords: | PACS: 73 20 At 61 16 Ch 72 10 Fk 73 20 Dx |
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