Work

Mechanisms of finite-temperature magnetism in the three-dimensional Hubbard model

Year: 2015

Type: article

Abstract: We examine the nature of the transition to the antiferromagnetically ordered state in the half-filled three-dimensional Hubbard model using the dual-fermion multiscale approach. Consistent with analytics, in the weak-coupling regime we find that spin-flip excitations across the Fermi surface are important and that the strong-coupling regime is described by Heisenberg physics. In the intermediate-interaction, strong-correlation regime we find aspects of both local and nonlocal correlations. We analyze the critical exponents of the transition in the strong-coupling regime and find them to be consistent with Heisenberg physics down to an interaction of $U/t=10$.

Source: Physical Review B

DOI: 10.1103/physrevb.92.144409

Authors: Daniel Hirschmeier, Hartmut Hafermann, Emanuel Gull, Alexander I. Lichtenstein, Andrey E. Antipov

Institutions: Universität Hamburg, Huawei Technologies (France), University of Michigan

Language: English

Topic: Physics of Superconductivity and Magnetism

Subfield: Condensed Matter Physics

Field: Physics and Astronomy

Domain: Physical Sciences

Open Access status: green