Different magic number behaviors in supported metal clusters |
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| Authors: | Peng Zhang Yiqun Xie Wenxian Zhang Xijing Ning Jun Zhuang |
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| Institution: | (1) Key Laboratory of Micro and Nano Photonic Structures, Ministry of Education, Department of Optical Science and Engineering, Fudan University, Shanghai, 200433, China;(2) Applied Ion Beam Physics Lab, Institute of Modern Physics, Fudan University, Shanghai, 200433, China; |
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| Abstract: | Two different magic number behaviors in supported metal clusters, which contain several to hundreds of atoms, are revealed
on a series of fcc(001) metal surfaces based on the calculations with the tight-binding potential. The magic number sequence
persists on some surfaces while gradually disappears on the others with the increasing cluster size. A theory is proposed
to explain these behaviors in terms of atomic interactions. We find in surprise that the different magic number behaviors
are triggered by the relatively weak adatom–adatom interactions between next nearest-neighbor (NNN) atoms, although the closed
shell of the magic cluster is enhanced by nearest-neighbor interactions. For an attractive NNN interaction, the closed shell
of the magic cluster is gradually destabilized and eventually broken, leading to the disappearance of the magic number sequence
with increasing cluster size. For a repulsive one, the closed shell and magic number sequence persists. Besides, our theory
also allows a good understanding of the equilibrium shape of Cu islands on the Cu(001) surface. |
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