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

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A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä
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Date
2007-04-27
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Mcode
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Language
en
Pages
12
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.
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Keywords
excited states, nanostructures, quantum wells, surface states
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Citation
Hakala , T , Puska , M 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 , vol. 75 , no. 16 , 165419 , pp. 1-12 . https://doi.org/10.1103/PhysRevB.75.165419