3-BODY SCATTERING-THEORY OF CORRELATED HOLE AND ELECTRON-STATES

被引:35
作者
CALANDRA, C
MANGHI, F
机构
[1] Dipartimento di Fisica, Università di Modena, I-41100 Modena
来源
PHYSICAL REVIEW B | 1994年 / 50卷 / 04期
关键词
D O I
10.1103/PhysRevB.50.2061
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
We describe a theoretical scheme for the determination of quasiparticle spectra starting from the energy band structure of a metal and treating the on-site Hubbard repulsion beyond the mean-field theory. The method relies upon an expansion of the many-body states in terms of uncorrelated states with a different number of electron-hole pairs. By truncating the expansion to include configurations with one or two pairs one can achieve approximate expressions of the electron and hole self-energies. The interparticle scattering matrices appearing in such expressions are conveniently calculated using the Fadeev approach. Calculations performed for a constant density of states allow us to illustrate the role of three-body correlations in the metal-insulator transitions.
引用
收藏
页码:2061 / 2074
页数:14
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