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Many-body interactions and Rashba splitting of the surface state on Cu(110)

AutorJiang, J.; Tsirkin, S. S.; Shimada, K.; Iwasawa, K.; Namatame, H.; Taniguchi, M.; Sklyadneva, I. Yu.; Heid, R.; Bohnen, K. -P.; Echenique, Pedro M.
Fecha de publicación2014
EditorAmerican Physical Society
CitaciónPhysical Review B 89(8): 085404 (2014)
ResumenUsing high-resolution angle-resolved photoemission spectroscopy, we elucidate the Rashba splitting of ΔkF=0.003 Å-1 near the Fermi level (EF) in the Shockley surface state of Cu(110) at the Ȳ point of the surface Brillouin zone. The observed energy-band dispersion exhibits a kink structure at ∼-20 meV, which is a clear indication of band renormalization caused by an electron-phonon interaction. The electron-phonon coupling parameter is found to be λep=0.17±0.02 based on the experimentally obtained real part of the self-energy. First-principle calculations yield λep=0.160 and ΔkF=0.004 Å-1 at EF, which are fully consistent with the experimental results. In addition, the contributions of the electron-electron and electron-phonon interactions to the linewidth of the surface state at the Ȳ point are experimentally determined to be Γee∼9 meV and Γep∼7 meV, respectively. We demonstrate that the Rashba splitting must be resolved by photoemission line-shape analysis for an accurate determination of the electron self-energy and coupling parameters. © 2014 American Physical Society.
DescripciónUnder the terms of the Creative Commons Attribution License 3.0 (CC-BY).-- et al.
Versión del editorhttp://dx.doi.org/10.1103/PhysRevB.89.085404
Identificadoresdoi: 10.1103/PhysRevB.89.085404
issn: 2469-9950
e-issn: 2469-9969
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