Unusually weak electron-phonon coupling in the Shockley surface state on Pd(111)

Electron-phonon (e−ph) coupling in the ¯Γ unoccupied surface state on Pd(111) is studied using density-functional perturbation-theory calculation and two-photon photoemission measurements. Also, an ab initio GW calculation is performed to combine it with the e−ph coupling evaluation in the study of...

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Detalhes bibliográficos
Autores: Sklyadneva, Irina Yu., Heid, Rolf, Silkin, Viatcheslav M., Melzer, A., Bohnen, Klaus-Peter, Echenique, Pedro M., Fauster, Th., Chulkov, Eugene V.
Tipo de documento: artigo
Estado:Versão publicada
Data de publicação:2009
País:España
Recursos:Consejo Superior de Investigaciones Científicas (CSIC)
Repositório:DIGITAL.CSIC. Repositorio Institucional del CSIC
OAI Identifier:oai:digital.csic.es:10261/226228
Acesso em linha:http://hdl.handle.net/10261/226228
Access Level:Acceso aberto
Descrição
Resumo:Electron-phonon (e−ph) coupling in the ¯Γ unoccupied surface state on Pd(111) is studied using density-functional perturbation-theory calculation and two-photon photoemission measurements. Also, an ab initio GW calculation is performed to combine it with the e−ph coupling evaluation in the study of the surface-state linewidth. We show that the e−ph coupling in the surface state is unusually weak. It is smaller by a factor of 5 than that at the Fermi surface of bulk Pd. Temperature-dependent two-photon photoemission measurements confirm this result indicating an important role of interband scattering from surface to bulk states.

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