Electron linewidths of wide-gap insulators: Excitonic effects in LiF

Based on a recent exchange-correlation kernel developed within time-dependent-density-functional theory we derive a practical and general expression for the three-point vertex function. We show that excitonic effects in LiF strongly modifies the low-energy electron linewidths leading to linear scali...

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Detalles Bibliográficos
Autores: Marini, Andrea, Rubio, Angel
Tipo de recurso: artículo
Estado:Versión publicada
Fecha de publicación:2004
País:España
Institución:Consejo Superior de Investigaciones Científicas (CSIC)
Repositorio:DIGITAL.CSIC. Repositorio Institucional del CSIC
OAI Identifier:oai:digital.csic.es:10261/98087
Acceso en línea:http://hdl.handle.net/10261/98087
Access Level:acceso abierto
Descripción
Sumario:Based on a recent exchange-correlation kernel developed within time-dependent-density-functional theory we derive a practical and general expression for the three-point vertex function. We show that excitonic effects in LiF strongly modifies the low-energy electron linewidths leading to linear scaling with quasiparticle energy. We also prove that, in contrast to previous results for the electron gas, simple metals, and semiconductors, vertex corrections in the self-energy and in the screening function do not compensate each other.

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