"Destruction" of the fermi surface due to pseudogap fluctuations in strongly correlated systems
E.Z. Kuchinskii, I.A. Nekrasov, M.V. Sadovskii
TL;DR
This paper extends dynamical mean field theory to include pseudogap fluctuation effects, revealing how these fluctuations cause Fermi surface destruction and arc formation in strongly correlated systems, aligning with experimental observations.
Contribution
The authors develop a generalized DMFT+ approach incorporating momentum-dependent self-energy to model non-local correlations in strongly correlated metals.
Findings
Fermi surface destruction and arc formation due to pseudogap fluctuations.
Enhanced blurring of the Fermi surface with increased Coulomb interaction.
Qualitative agreement with ARPES experimental results.
Abstract
We generalize the dynamical - mean field theory (DMFT) by including into the DMFT equations dependence on correlation length of pseudogap fluctuations via additional (momentum dependent) self - energy. This self - energy describes non - local dynamical correlations induced by short - ranged collective SDW - like antiferromagnetic spin (or CDW - like charge) fluctuations. At high enough temperatures these fluctuations can be viewed as a quenched Gaussian random field with finite correlation length. This generalized DMFT+\Sigma_k approach is used for the numerical solution of the weakly doped one - band Hubbard model with repulsive Coulomb interaction on a square lattice with nearest and next nearest neighbour hopping. The effective single impurity problem is solved by numerical renormalization group (NRG). Both types of strongly correlated metals, namely (i) doped Mott insulator and (ii)…
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