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|Title:||Formation and stabilization of Fe-induced magic clusters on Si(1 1 1)-(7 × 7) template||Authors:||Zilani, M.A.K.
|Keywords:||Density functional calculations
Scanning tunneling microscopy
|Issue Date:||15-Jun-2007||Citation:||Zilani, M.A.K., Sun, Y.Y., Xu, H., Peng, G.W., Feng, Y.P., Wang, X.-S., Wee, A.T.S. (2007-06-15). Formation and stabilization of Fe-induced magic clusters on Si(1 1 1)-(7 × 7) template. Surface Science 601 (12) : 2486-2490. ScholarBank@NUS Repository. https://doi.org/10.1016/j.susc.2007.04.181||Abstract:||We demonstrate the growth of Fe-induced magic clusters on Si(1 1 1)-(7 × 7) template by in situ scanning tunneling microscopy (STM). These clusters form near a dimer row at one side of the half-unit cell (HUC); and with three different equivalent orientations. A cluster model comprising three top layer Si atoms bonded to six Fe atoms at the next layer in the 7 × 7 faulted-half template is proposed. The optimized cluster structure determined by first-principles total-energy calculation shows an inward-shifting of the three center Fe atoms. The clusters and the nearby center-adatoms of the next HUCs appear with a significantly reduced height below bias voltages 0.4 V in high resolution empty-state STM images, suggesting an energy gap opening near the Fermi level at these localized cluster and adatom sites. We explain the stabilization of the clusters on the 7 × 7 template using the gain in electronic energy as the driving force for cluster formation. © 2007.||Source Title:||Surface Science||URI:||http://scholarbank.nus.edu.sg/handle/10635/96665||ISSN:||00396028||DOI:||10.1016/j.susc.2007.04.181|
|Appears in Collections:||Staff Publications|
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