Phonon contribution to quasiparticle lifetimes in Cu measured by angle-resolved photoemission
- Physics Department, Brandeis University, Waltham, Massachusetts 02254 (United States)
The line shape of the photoelectron spectrum emitted from the {ital sp}-derived surface state at {bar {Gamma}} on Cu(111) is investigated. The line shape is Lorentzian, and the temperature dependence of the width is linear, varying from 30 meV at 30 K to 75 meV at 625 K. Less than 5-meV variation with binding energy is observed. The temperature dependence is explained as the phonon contribution to the inverse hole lifetime, predicted to be 2{pi}{lambda}{ital k}{sub {ital b}}{ital T} allowing the determination that the electron-phonon mass enhancement parameter {lambda}=0.14{plus_minus}0.02 for this surface state at {bar {Gamma}}. This is compared to {lambda}=0.15 reported as an average over the bulk Fermi surface.
- Research Organization:
- Argonne National Laboratory (ANL), Argonne, IL
- DOE Contract Number:
- W-31109-ENG-38
- OSTI ID:
- 69471
- Journal Information:
- Physical Review, B: Condensed Matter, Journal Name: Physical Review, B: Condensed Matter Journal Issue: 19 Vol. 51; ISSN 0163-1829; ISSN PRBMDO
- Country of Publication:
- United States
- Language:
- English
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