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5 papers · 2 filters
Practical consequences of Luttinger-Ward functional multivaluedness for cluster DMFT methods
Jaksa Vucicevic, Nils Wentzell, Michel Ferrero +1
The Luttinger-Ward functional (LWF) has been a starting point for conserving approximations in many-body physics for 50 years. The recent discoveries of its multivaluedness and the…
Frustrated spin order and stripe fluctuations in FeSe
Andreas Baum, Harrison N. Ruiz, Nenad Lazarević +9
The charge and spin dynamics of the structurally simplest iron-based superconductor, FeSe, may hold the key to understanding the physics of high temperature superconductors in gene…
The Fierz convergence criterion: a controlled approach to strongly-interacting systems with small embedded clusters
Thomas Ayral, Jaksa Vucicevic, Olivier Parcollet
We present an embedded-cluster method, based on the TRILEX formalism. It turns the Fierz ambiguity, inherent to approaches based on a bosonic decoupling of local fermionic interact…
Emergent Chiral Spin State in the Mott Phase of a Bosonic Kane-Mele-Hubbard Model
Kirill Plekhanov, Ivana Vasić, Alexandru Petrescu +4
Recently, the frustrated XY model for spins-1/2 on the honeycomb lattice has attracted a lot of attention in relation with the possibility to realize a chiral spin liquid state. Th…
TRILEX and +EDMFT approach to -wave superconductivity in the Hubbard model
Jaksa Vucicevic, Thomas Ayral, Olivier Parcollet
We generalize the recently introduced TRILEX approach (TRiply Irreducible Local EXpansion) to superconducting phases. The method treats simultaneously Mott and spin-fluctuation phy…