Altermagnetic anomalous Hall effect emerging from electronic correlations

Abstract

While altermagnetic materials are characterized by a vanishing net magnetic moment, their symmetry in principle allows for the existence of an anomalous Hall effect (AHE). Here we introduce a model with altermagnetism in which the emergence of an AHE is driven by interactions. This model is grounded in a modified Kane-Mele framework with antiferromagnetic (AFM) spin-spin correlations. Quantum Monte Carlo simulations show that the system undergoes a finite temperature phase transition governed by a primary AFM order parameter accompanied by a secondary one of Haldane type. The emergence of both orders turns the metallic state of the system, away from half-filling, to an altermagnet with a finite anomalous Hall conductivity. A mean field ansatz corroborates these results, which pave the way into the study of correlation induced altermagnets with finite Berry curvature.

5 pages, 3 figures

References in corpus (6)

• Topological Field Theory of Time-Reversal Invariant Insulators
• Observation of antiferromagnetic correlations in the Hubbard model with ultracold atoms
• Direct observation of altermagnetic band splitting in CrSb thin films
• Landau Theory of Altermagnetism
• Topological and geometrical aspects of band theory
• Realizing Altermagnetism in Fermi-Hubbard Models with Ultracold Atoms

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