Anomalous One-Particle Properties in the Normal State of a Model with Superconductivity

The main purpose of this study is to investigate the influence of the strong superconducting fluctuations in the d-wave channel on the normal state properties of a simple two-dimensional strongly correlated Fermi-system. We achieve this goal using a thermodynamically self-consistent Baym–Kadanoff conserving Green’s function approximation (formulation is based on a well-defined free energy and conserving particle number, momentum, and energy), which is known to produce reliable results for the s-wave superconductors well beyond the weak coupling limit up to the range where the interaction strength is comparable to the bandwidth of the quasiparticle spectrum. The research shows that pairing correlations above lead to the appearance of a highly anisotropic pseudogap in the electronic spectral function and the destruction of the Fermi surface. We conclude that our results are in remarkable agreement with the available experimental angle-resolved photoemission data on the high temperature superconductors.

Publication year: 
2013
Issue: 
5
УДК: 
537.312.62
С. 73–79., укр., Іл. 3. Бібліогр.: 27 назв.
References: 

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