Regensburg 2022 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 34: Correlated Electrons: Theory 2

TT 34.11: Vortrag

Donnerstag, 8. September 2022, 17:45–18:00, H23

Thermodynamics of the metal-insulator transition in the extended Hubbard model from determinantal quantum Monte Carlo — •Alexander Sushchyev and Stefan Wessel — RWTH Aachen University

We use finite-temperature determinantal quantum Monte Carlo simulations to study the thermodynamic properties of the extended Hubbard model on the square lattice at half-filling. In particular, we consider the effect of a nearest-neighbor and a long-range Coulomb repulsion on the thermal metal-insulator transition in the Slater regime at intermediate coupling. Within the parameter regime accessible to sign-free quantum Monte Carlo simulations we explore in detail the temperature dependence of the double occupancy and entropy. Notably, we probe for signatures of a first-order metal-insulator transition driven by the suppression of correlation effects by the non-local interactions, as proposed in [1].

[1] M.Schueler et al., Sci. Post. Phys. 6, 067 (2019)