Lifetimes of excited electrons in Ta: Experimental time-resolved photoemission data and first-principles GW + T theory

Time-resolved two-photon photoemission spectroscopy and first-principles GW and GW+T theories have been used to study excited electron lifetimes in tantalum. The GW+T approach includes evaluation of the lowest self-energy term of the many-body perturbation theory in the GW approximation and higher t...

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Detalhes bibliográficos
Autores: Zhukov, Vladlen P., Andreyev, O., Hoffmann, D., Bauer, M., Aeschlimann, M., Chulkov, Eugene V., Echenique, Pedro M.
Formato: artículo
Estado:Versión publicada
Fecha de publicación:2004
País:España
Recursos:Consejo Superior de Investigaciones Científicas (CSIC)
Repositorio:DIGITAL.CSIC. Repositorio Institucional del CSIC
OAI Identifier:oai:digital.csic.es:10261/225110
Acesso em linha:http://hdl.handle.net/10261/225110
Access Level:acceso abierto
Descrição
Resumo:Time-resolved two-photon photoemission spectroscopy and first-principles GW and GW+T theories have been used to study excited electron lifetimes in tantalum. The GW+T approach includes evaluation of the lowest self-energy term of the many-body perturbation theory in the GW approximation and higher terms in the T-matrix approximation. The GW+T calculated lifetimes are in good agreement with the measured lifetimes at excitation energies above 1.6eV. At lower energies, a slightly worse agreement between theoretical and experimental data is obtained which we refer to as the influence of cascade processes.

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