Criticism of the Single-Particle-Green's-Function Approach to the Excitation Spectrum of Superfluid Liquid Helium

1972 ◽  
Vol 5 (1) ◽  
pp. 338-341 ◽  
Author(s):  
J. P. Straley
Keyword(s):  
Green’S Function ◽  
Liquid Helium ◽  
Excitation Spectrum ◽  
Green's Function ◽  
Single Particle ◽  
Function Approach

Pseudogap Formation in CeNiSn

1998 ◽  
Vol 12 (05) ◽  
pp. 197-204
Author(s):  
Feng Xiao-Bing
Keyword(s):  
Green’S Function ◽  
Temperature Dependence ◽  
Excitation Spectrum ◽  
Green's Function ◽  
Single Particle ◽  
Anderson Model ◽  
Periodic Anderson Model ◽  
Decoupling Method ◽  
Single Particle Excitation

Using Green's function decoupling method the single particle excitation spectrum of the periodic Anderson model is studied. With increasing hybridization potential in the Kondo regime there appear pseudogaps in the excitation spectrum of the two kinds of carriers. The temperature dependence of the pseudogaps is qualitatively in accordance with tunneling experiments on CeNiSn.

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