Quantum size effects in Pb islands on Cu(111): Electronic-structure calculations

Details Quantum size effects in Pb islands on Cu(111): Electronic-structure calculations Quantum size effects in Pb islands on Cu(111): Electronic-structure calculations

2003-10-22

arxiv.org/abs/cond-mat/0310533v1

Physics

Condensed Matter

Materials Science

4 pages, 4 figures. Submitted

Scientific paper

10.1103/PhysRevB.69.153410

The appearance of "magic" heights of Pb islands grown on Cu(111) is studied by self-consistent electronic structure calculations. The Cu(111) substrate is modeled with a one-dimensional pseudopotential reproducing the essential features, i.e. the band gap and the work function, of the Cu band structure in the [111] direction. Pb islands are presented as stabilized jellium overlayers. The experimental eigenenergies of the quantum well states confined in the Pb overlayer are well reproduced. The total energy oscillates as a continuous function of the overlayer thickness reflecting the electronic shell structure. The energies for completed Pb monolayers show a modulated oscillatory pattern reminiscent of the super-shell structure of clusters and nanowires. The energy minima correlate remarkably well with the measured most probable heights of Pb islands. The proper modeling of the substrate is crucial to set the quantitative agreement.

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