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 language | English |
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Article number | 165419 |
Pages (from-to) | 1-12 |
Number of pages | 12 |
Journal | Physical Review B |
Volume | 75 |
Issue number | 16 |
DOIs | |
Publication status | Published - 27 Apr 2007 |
MoE publication type | A1 Journal article-refereed |
Keywords
- excited states
- nanostructures
- quantum wells
- surface states