A Possible Fermi-Surface Deformation ...
A Possible Fermi-Surface Deformation ...
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可能的费米面变形......
DOI：
10.1088/1742-6596/273/1/012057
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发表时间：
2011
期刊：
影响因子：
--
通讯作者：
H. Kusunose
中科院分区：
文献类型：
--
作者：
T. Sugibayashi;H. Kusunose
The possibility of a significant Fermi-surface deformation as a result of valence crossover in mixed-valence systems is investigated theoretically. The Anderson lattice model on a square lattice with an additional local repulsion between c and f electrons is used to set up a system that shows a sudden valence crossover upon making small changes in the parameters. Analyzing the model using the dynamical mean-field theory demonstrates a significant change of the Fermi surface across the valence crossover. Thus, the structure of the irreducible susceptibility in the momentum-frequency space changes completely, which results in a significant change of effective interactions among quasiparticles. It also smears out high-energy Hubbard satellite bands in the weakly correlated regime, which provides a direct experimental test for identifying a sudden valence crossover.
