A channel decomposition with equal and opposite charge and spin bare interactions removes the leading irreducible vertex contributions, yielding an effective fermion-boson theory (TRILEX2) that largely avoids the Fierz ambiguity.
Effect of non-local correlations on the electronic structure of LiFeAs
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abstract
We investigate the role of non-local correlations in LiFeAs by exploring an ab-initio-derived multi-orbital Hubbard model for LiFeAs via the Two-Particle Self-Consistent (TPSC) approach. The multi-orbital formulation of TPSC approximates the irreducible interaction vertex to be an orbital-dependent constant, which is self-consistently determined from local spin and charge sum rules. Within this approach, we disentangle the contribution of local and non-local correlations in LiFeAs and show that in the local approximation one recovers the dynamical-mean field theory (DMFT) result. The comparison of our theoretical results to most recent angular-resolved photoemission spectroscopy (ARPES) and de-Haas van Alphen (dHvA) data shows that non-local correlations in LiFeAs are decisive to describe the measured spectral function $A(\vec k,\omega)$, Fermi surface and scattering rates. These findings underline the importance of non-local correlations and benchmark different theoretical approaches for iron-based superconductors.
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cond-mat.str-el 1years
2019 1verdicts
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Consistent partial bosonization of the extended Hubbard model
A channel decomposition with equal and opposite charge and spin bare interactions removes the leading irreducible vertex contributions, yielding an effective fermion-boson theory (TRILEX2) that largely avoids the Fierz ambiguity.