scholarly journals Thermodynamics of Eliashberg theory in the weak-coupling limit

2020 ◽  
Vol 102 (21) ◽  
Author(s):  
Sepideh Mirabi ◽  
Rufus Boyack ◽  
F. Marsiglio
2021 ◽  
Vol 2021 (3) ◽  
Author(s):  
Pengfei Zhang ◽  
Yingfei Gu ◽  
Alexei Kitaev

Abstract We argue that “stringy” effects in a putative gravity-dual picture for SYK-like models are related to the branching time, a kinetic coefficient defined in terms of the retarded kernel. A bound on the branching time is established assuming that the leading diagrams are ladders with thin rungs. Thus, such models are unlikely candidates for sub-AdS holography. In the weak coupling limit, we derive a relation between the branching time, the Lyapunov exponent, and the quasiparticle lifetime using two different approximations.


1996 ◽  
Vol 10 (30) ◽  
pp. 1483-1490 ◽  
Author(s):  
M. MORENO ◽  
R. M. MÉNDEZ-MORENO ◽  
M. A. ORTIZ ◽  
S. OROZCO

Multi-band superconductors are analyzed and the relevance of overlapping energy bands to the high-T c of these materials is studied. Within the BCS framework, a two band model with generalized Fermi surface topologies is developed. Values of the overlapped occupancy parameters for typical cuprate superconductors are obtained as a function of the ratio R and the effective coupling constant, λ, in the weak-coupling limit. The overlap scale is of the order or lower than the cutoff (Debye) energy. The typical behavior of the isotope effect is obtained. As these superconductors have transition temperatures above the phonon barrier, the results of this approach are important to the generic understanding of the high-T c superconducting mechanism.


2018 ◽  
Vol 122 (15) ◽  
pp. 8082-8093 ◽  
Author(s):  
Merle I. S. Röhr ◽  
Henning Marciniak ◽  
Joscha Hoche ◽  
Maximilian H. Schreck ◽  
Harald Ceymann ◽  
...  

Physica B+C ◽  
1984 ◽  
Vol 123 (2) ◽  
pp. 131-155 ◽  
Author(s):  
M.F.H. Schuurmans ◽  
J.M.F. van Dijk

Sign in / Sign up

Export Citation Format

Share Document