Correlations in Novel Quantum Materials 2022 (CNQM2022)

Spin and charge response and pseudogap in the 2D Hubbard model

Jun 22, 2022, 11:15 AM

30m

2D5 (Max Planck Institut für Festkörperforschung)

Keynote Talk / Invited Talk Numerical Approaches to Quantum Materials

Speaker

Michel Ferrero (Ecole Polytechnique)

Description

I will present recent numerically exact finite-temperature results for the two-dimensional Hubbard model obtained by diagrammatic Monte Carlo. I will show that there are several correlation regimes characterized by different magnetic correlation lengths and interaction strengths. I will discuss the connection between these regimes and the onset of a pseudogap. Finally, I will try to shake hands with ground-state results and discuss how a stripe-ordered ground-state can eventually be recovered at low doping and how it is connected to the fate of the pseudogap at zero temperature.