Superconductivity enhanced by d-density wave: A weak-coupling theory

2011 ◽  
Vol 406 (8) ◽  
pp. 1459-1465 ◽  
Author(s):  
Kim Ha ◽  
Ri Subok ◽  
Ri Ilmyong ◽  
Kim Cheongsong ◽  
Feng Yuling



1983 ◽  
Vol 61 (11) ◽  
pp. 1479-1485 ◽  
Author(s):  
I. D. Cox ◽  
W. E. Hagston ◽  
B. J. Holmes

Damping theory of an open system S is usually formulated in terms of projection operators which introduce nonuniqueness into the analysis. An insight into the nature of the approximations that arise from this aspect of the formalism is revealed by considering systems of varying complexity. This leads to the conclusion that the results of higher order perturbation theory approximations may not be meaningful.











1991 ◽  
Vol 43 (16) ◽  
pp. 13724-13727 ◽  
Author(s):  
Yunkyu Bang ◽  
G. Kotliar ◽  
C. Castellani ◽  
M. Grilli ◽  
R. Raimondi


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