Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2003-11-24
Physical Review Letters 92, 256602 (2004)
Physics
Condensed Matter
Strongly Correlated Electrons
4 pages, 5 figures, published version
Scientific paper
10.1103/PhysRevLett.92.256602
We present a general theory for the Fano resonance in Anderson impurity systems. It is shown that the broadening of the impurity level leads to an additional and important contribution to the Fano resonance around the Fermi surface, especially in the mixed valence regime. This contribution results from the interference between the Kondo resonance and the broadened impurity level. Being applied to the scanning tunnelling microscopic experiments, we find that our theory gives a consistent and quantitative account for the Fano resonance lineshapes for both Co and Ti impurities on Au or Ag surfaces. The Ti systems are found to be in the mixed valence regime.
Luo Hong-Gang
Su Zhao-Bin
Wang Xiao Qian
Xiang Tao
Yu Lu
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