Initial Adsorption and Kondo Resonance of 5,10,15,20-Tetrakis(4-bromophenyl)porphyrin–Co Molecules on Ag/Si(111) Surface Studied by Low-Temperature Scanning Tunneling Microscopy/Spectroscopy
Initial Adsorption and Kondo Resonance of 5,10,15,20-Tetrakis(4-bromophenyl)porphyrin–Co Molecules on Ag/Si(111) Surface Studied by Low-Temperature Scanning Tunneling Microscopy/Spectroscopy
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DOI：
10.1143/jjap.48.08jb01
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发表时间：
2009-08
影响因子：
1.5
通讯作者：
Q. Li;Shiro Yamazaki;T. Eguchi;Howon Kim;S. Kahng;Jingpin Jia;Q. Xue;Y. Hasegawa
中科院分区：
文献类型：
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作者：
Q. Li;Shiro Yamazaki;T. Eguchi;Howon Kim;S. Kahng;Jingpin Jia;Q. Xue;Y. Hasegawa
用低温扫描隧道显微镜/光谱（STM/S）研究了自旋活性的5，10，15，20-四（4-溴苯基）卟啉-Co（TBrPP-Co）分子在Si（111）-Ag × Ag表面的初始吸附和随后的近藤共振.与Cu（111）表面的情况不同，TBrPP-Co单分子通过其4个Br原子与Ag原子的键合，以平面构象锚定，并发生轻微的形变.在吸附于金属表面的孤立单分子上方也成功地观察到了近藤共振。由于半导体Si在费米能级上没有电子态，因此只有表面态电子对观察到的近藤共振有贡献。
The initial adsorption and subsequent Kondo resonance of spin-active 5,10,15,20-tetrakis(4-bromophenyl)porphyrin–Co (TBrPP–Co) molecules on a Si(111)–√3×√3 Ag surface have been studied using low-temperature scanning tunneling microscopy/spectroscopy (STM/S). Different from the case on the Cu(111) surface, all the isolated single TBrPP–Co molecules are anchored in a planar conformation with a slight distortion via their four Br atoms bonding with the Ag atoms of the reconstructed surface structure. The Kondo resonance was also successfully observed above the isolated single molecules adsorbed on the metallic surface. Since the semiconducting Si do not have electronic states at the Fermi level, only the surface state electrons contribute to the observed Kondo resonance.