Two-dimensional Hubbard model at finite temperature: Weak, strong, and long correlation regimes - Archive ouverte HAL
Article Dans Une Revue Physical Review Research Année : 2022

Two-dimensional Hubbard model at finite temperature: Weak, strong, and long correlation regimes

Résumé

We investigate the momentum-resolved spin and charge susceptibilities, as well as the chemical potential and double occupancy in the two-dimensional Hubbard model as functions of doping, temperature and interaction strength. Through these quantities, we identify a weak-coupling regime, a strong-coupling regime with short-range correlations and an intermediate-coupling regime with long magnetic correlation lengths. In the spin channel, we observe an additional crossover from commensurate to incommensurate correlations. In contrast, we find charge correlations to be only short ranged for all studied temperatures, which suggests that the spin and charge responses are decoupled. These findings were obtained by a novel connected determinant diagrammatic Monte Carlo algorithm for the computation of double expansions, which we introduce in this paper. This permits us to obtain numerically exact results at unprecedentedly low temperatures $T\geq 0.067$ for interactions up to $U\leq 8$, while working on arbitrarily large lattices. Our method also allows us to gain physical insights from investigating the analytic structure of perturbative series. We connect to previous work by studying smaller lattice geometries and report substantial finite-size effects.

Dates et versions

hal-03375867 , version 1 (13-10-2021)

Identifiants

Citer

Fedor Šimkovic Iv, Riccardo Rossi, Michel Ferrero. Two-dimensional Hubbard model at finite temperature: Weak, strong, and long correlation regimes. Physical Review Research, 2022, 4 (4), pp.043201. ⟨10.1103/PhysRevResearch.4.043201⟩. ⟨hal-03375867⟩

Altmetric

Partager

More