TRILEX and GW+EDMFT approach to d-wave superconductivity in the Hubbard model

Abstract : We generalize the recently introduced TRILEX approach (TRiply Irreducible Local EXpansion) to superconducting phases. The method treats simultaneously Mott and spin-fluctuation physics using an Eliashberg theory supplemented by local vertex corrections determined by a self-consistent quantum impurity model. We show that, in the two-dimensional Hubbard model, at strong coupling, TRILEX yields a $d$-wave superconducting dome as a function of doping. Contrary to the standard cluster dynamical mean field theory (DMFT) approaches, TRILEX can capture $d$-wave pairing using only a single-site effective impurity model. We also systematically explore the dependence of the superconducting temperature on the bare dispersion at weak coupling, which shows a clear link between strong antiferromagnetic (AF) correlations and the onset of superconductivity. We identify a combination of hopping amplitudes particularly favorable to superconductivity at intermediate doping. Finally, we study within $GW$+EDMFT the low-temperature $d$-wave superconducting phase at strong coupling in a region of parameter space with reduced AF fluctuations.
Type de document :
Pré-publication, Document de travail
t17/105. 22 pages, 17 figures. 2017

https://hal-cea.archives-ouvertes.fr/cea-01550542
Contributeur : Emmanuelle De Laborderie <>
Soumis le : jeudi 29 juin 2017 - 16:05:58
Dernière modification le : jeudi 12 avril 2018 - 01:50:41

Identifiants

• HAL Id : cea-01550542, version 1
• ARXIV : 1705.08332

Citation

Jaksa Vucicevic, Thomas Ayral, Olivier Parcollet. TRILEX and GW+EDMFT approach to d-wave superconductivity in the Hubbard model. t17/105. 22 pages, 17 figures. 2017. 〈cea-01550542〉

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