Pantheon SEMPARIS Le serveur des séminaires parisiens Paris

Status Confirmed
Seminar Series SEM-LPTMC
Subjects cond-mat.mes-hall
Date Monday 14 December 2020
Time 16:00
Institute LPTMC
Seminar Room On-line zoom seminar
Speaker's Last Name Rossi
Speaker's First Name Riccardo
Speaker's Email Address riccardorossi4 [at] gmail [dot] com
Speaker's Institution Simons Foundation, Flatiron, New-York
Title High-order renormalized perturbative approach for strongly-correlated fermions
Abstract In this talk I show how perturbation theory can be turned into a viable computational approach for physical systems afflicted by the fermionic sign problem. This is accomplished by designing new numerical approaches to reach arbitrary-high orders for the bare [1] and the renormalized [2] expansion. I discuss the results obtained for the doped square-lattice Hubbard model in the pseudogap regime, and in frustrated lattices. Finally, I present the first unbiased diagrammatic computation in a broken-symmetry phase by discussing the s-wave superfluid transition in the spin-polarized cubic-lattice attractive Hubbard model. [1] RR, PRL 119, 045701 (2017) [2] RR, Simkovic, Ferrero, EPL 132, 11001 (2020)
arXiv Preprint Number
Comments ID de réunion : 969 0302 5813 Code secret : 007425

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