Local changes of work function near rough features on Cu surfaces operated under high external electric field

Julkaisun otsikon käännös: Local changes of work function near rough features on Cu surfaces operated under high external electric field

Flyura Djurabekova, Avaz Ruzibaev, Eero Holmstrom, Stefan Parviainen, Mikko Hakala

Tutkimustuotos: ArtikkelijulkaisuArtikkeliTieteellinenvertaisarvioitu

Abstrakti

Metal surfaces operated under high electric fields produce sparks even if they are held in ultra high vacuum. In spite of extensive research on the topic of vacuum arcs, the mystery of vacuum arc origin still remains unresolved. The indications that the sparking rates depend on the material motivate the research on surface response to extremely high external electric fields. In this work by means of density-functional theory calculations we analyze the redistribution of electron density on {100} Cu surfaces due to self-adatoms and in presence of high electric fields from -1V/nm up to -2V/nm (-1 to -2 GV/m, respectively). We also calculate the partial charge induced by the external field on a single adatom and a cluster of two adatoms in order to obtain reliable information on charge redistribution on surface atoms, which can serve as a benchmarking quantity for the assessment of the electric field effects on metal surfaces by means of molecular dynamics simulations. Furthermore, we investigate the modifications of work function around rough surface features, such as step edges and self-adatoms. (C) 2013 AIP Publishing LLC.
Julkaisun otsikon käännösLocal changes of work function near rough features on Cu surfaces operated under high external electric field
Alkuperäiskielienglanti
LehtiJournal of Applied Physics
Vuosikerta114
Numero24
Sivut1-7
Sivumäärä7
ISSN0021-8979
DOI - pysyväislinkit
TilaJulkaistu - 2013
OKM-julkaisutyyppiA1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä, vertaisarvioitu

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