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

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Journal Title
Journal ISSN
Volume Title
School of Science | A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä
Date
2007
Major/Subject
Mcode
Degree programme
Language
en
Pages
165419/1-12
Series
Physical Review B, Volume 75, Issue 16
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.
Description
Keywords
excited states, quantum wells, surface states, nanostructures
Other note
Citation
Hakala, T. & Puska, Martti J. & Borisov, A. G. & Silkin, V. M. & Zabala, N. & Chulkov, E. V. 2007. Excited states of Na nanoislands on the Cu(111) surface. Physical Review B. Volume 75, Issue 16. 165419/1-12. ISSN 1550-235X (electronic). DOI: 10.1103/physrevb.75.165419.