Excited states of Na nanoislands on the Cu(111) surface

Tero Hakala, M.J. Puska, A.G. Borisov, V.M. Silkin, N. Zabala, E.V. Chulkov

Research output: Contribution to journalArticleScientificpeer-review

16 Citations (Scopus)
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Abstract

Electronic states of one monolayer high Na nanoislands on the Cu(111) surface are studied as a function of the nanoisland size. Properties of nanoislands such as one-electron states, the electron density, and the associated potential are obtained self-consistently within the density-functional formalism using a one-dimensional pseudopotential for the Cu(111) substrate and the jellium model for Na. A wave packet propagation method is used to study the energies and lifetimes of quasistationary states localized at Na islands. For very large islands, island-localized states merge into the two-dimensional continuum of the Na quantum well state. Thus, we assign the quasistationary states studied as arising from the quantization of the two-dimensional quantum well continuum due to the finite island size. The scattering at the island boundaries results in the energy-conserving resonant electron transfer into the continuum of the substrate states broadening the island-localized states into resonances.
Original languageEnglish
Article number165419
Pages (from-to)1-12
Number of pages12
JournalPhysical Review B
Volume75
Issue number16
DOIs
Publication statusPublished - 27 Apr 2007
MoE publication typeA1 Journal article-refereed

Keywords

  • excited states
  • nanostructures
  • quantum wells
  • surface states

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