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Electronic structure of MgO-Supported au clusters:: Quantum dots probed by scanning tunneling microscopy

被引：44
作者：
Walter, Michael
Frondelius, Pentti
Honkala, Karoliina
Hakkinen, Hannu
机构：
[1] Univ Jyvaskyla, Nanosci Ctr, Dept Phys, FIN-40014 Jyvaskyla, Finland
[2] Univ Jyvaskyla, Nanosci Ctr, Dept Chem, FIN-40014 Jyvaskyla, Finland
来源：
PHYSICAL REVIEW LETTERS | 2007年 / 99卷 / 09期
关键词：
D O I：
10.1103/PhysRevLett.99.096102
中图分类号：
O4 [物理学];
学科分类号：
0702 ;
摘要：
We investigate via density functional theory (DFT) the appearance of small MgO-supported gold clusters with 8 to 20 atoms in a scanning tunneling microscope (STM) experiment. Comparison of simulations of ultrathin films on a metal support with a bulk MgO leads to similar results for the cluster properties relevant for STM. Simulated STM pictures show the delocalized states of the cluster rather than the atomic structure. This finding is due to the presence of s- derived delocalized states of the cluster near the Fermi energy. The properties of theses states can be understood from a jellium model for monovalent gold.
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页数：4
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