吸附位置对分子近藤效应的影响

The role of adsorption sites in the molecular kondo effect

摘要: 文章报道了利用低温扫描隧道显微镜观察到磁性分子酞菁铁（iron phthalocyanine, FePc）在金属表面Au(111)上的近藤效应（Kondo effect）.从实验上观察到两种由近藤效应引起的不同的Fano共振现象.通过理论模拟和分析，文章作者发现这两种Fano共振分别对应于不同的分子吸附位置.吸附位置不仅影响Fano共振的线型，而且还影响自旋电子的耦合强度，是调控金属表面磁性杂质自旋态的重要途径.

Abstract: We report on the observation of the Kondo effect for single iron phthalocyanine (FePc) magnetic molecules on an Au(111) surface using low temperature scanning tunneling microscopy. Two different Fano resonances induced by the Kondo effect have been observed experimentally. Through theoretical simulation and analysis we find that these two resonances correspond to different molecular adsorption sites. Adsorption sites play an important role both in the line shape of Fano resonances and in the strength of the spin-electron coupling. This provides an effective and practical method for tuning the spin-related properties of magnetic impurities on metal surfaces.