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Mott physics and collective modes: an atomic approximation of the four-particle irreducible functional

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Abstract

We discuss a generalization of the dynamical mean field theory (DMFT) for strongly correlated systems close to a Mott transition based on a systematic approximation of the fully irreducible four-point vertex. It is an atomic-limit approximation of a functional of the one- and two-particle Green functions, built with the second Legendre transform of the free energy with respect to the two-particle Green function. This functional is represented diagrammatically by four-particle irreducible (4PI) diagrams. Like the dynamical vertex approximation (D$\Gamma$A), the fully irreducible vertex is computed from a quantum impurity model whose bath is self-consistently determined by solving the parquet equations. However, in contrast with D$\Gamma$A and DMFT, the interaction term of the impurity model is also self-consistently determined. The method interpolates between the parquet approximation at weak coupling and the atomic limit, where it is exact. It is applicable to systems with short-range and long-range interactions.

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Dates and versions

cea-01341620 , version 1 (04-07-2016)
cea-01341620 , version 2 (03-10-2022)

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Thomas Ayral, Olivier Parcollet. Mott physics and collective modes: an atomic approximation of the four-particle irreducible functional. 2016. ⟨cea-01341620v1⟩
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