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Fluctuation diagnostic of the nodal/antinodal dichotomy in the Hubbard model at weak coupling: a parquet dual fermion approach
Friedrich Krien, Alexander I. Lichtenstein, Georg Rohringer
We apply the boson exchange parquet solver for dual fermions to the half-filled Hubbard model on a square lattice at small interaction. Our results establish that, in this regime,…
Orbital isotropy of magnetic fluctuations in correlated electron materials induced by Hund's exchange coupling
Evgeny A. Stepanov, Yusuke Nomura, Alexander I. Lichtenstein +1
Characterizing non-local magnetic fluctuations in materials with strong electronic Coulomb interactions remains one of the major outstanding challenges of modern condensed matter t…
Dual fermion method as a prototype of generic reference-system approach for correlated fermions
Sergey Brener, Evgeny A. Stepanov, Alexey N. Rubtsov +2
We present a purely diagrammatic derivation of the dual fermion scheme [Phys. Rev. B 77 (2008) 033101]. The derivation makes particularly clear that a similar scheme can be develop…
Boson-Exchange Parquet Solver for dual fermions
Friedrich Krien, Angelo Valli, Patrick Chalupa +3
We present and implement a parquet approximation within the dual-fermion formalism based on a partial bosonization of the dual vertex function which substantially reduces the compu…
Collective magnetic fluctuations in Hubbard plaquettes captured by fluctuating local field method
Alexey N. Rubtsov, Evgeny A. Stepanov, Alexander I. Lichtenstein
We establish a way to handle main collective fluctuations in correlated quantum systems based on a Fluctuation Local Field concept. This technique goes beyond standard mean-field a…
Dual Boson Diagrammatic Monte Carlo Approach Applied to the Extended Hubbard Model
M. Vandelli, V. Harkov, E. A. Stepanov +4
In this work we introduce the Dual Boson Diagrammatic Monte Carlo technique for strongly interacting electronic systems. This method combines the strength of dynamical mean-filed t…