RCQM/FCMP: J.van den Brink: Altermagnetic Anomalous Hall Effect Emerging from Electronic Correlation скачать в хорошем качестве

RCQM/FCMP: J.van den Brink: Altermagnetic Anomalous Hall Effect Emerging from Electronic Correlation

Tuesday, Sep./09/2025, 2:00 PM to 3:30 PM (Houston) Speaker: Jeroen van den Brink Institution: Institute for Theoretical Solid State Physics, IFW Dresden, Germany Title: Altermagnetic Anomalous Hall Effect Emerging from Electronic Correlations Abstract: Altermagnetic materials are characterized by collinear magnetic order with a vanishing net magnetic moment, but nevertheless have a spin-splitting in their non-relativistic electronic band structure. From ab initio calculations, we have identified around 60 altermagnetic materials. From a theoretical point of view, several physical properties that render altermagnets different from canonical antiferro-, ferro- and ferri-magnets will be discussed. These include certain spin and heat transport features and piezomagnetic responses. By symmetry in principle also an anomalous Hall effect (AHE) is allowed in certain altermagnets. In particular we introduce an altermagnetic model in which the emergence of an AHE is driven by interactions. Quantum Monte Carlo simulations show that the system undergoes a finite temperature phase transition governed by a primary antiferromagnetic order parameter accompanied by a secondary altermagnetic one. The emergence of both orders turns the metallic state of the system, away from half-filling, into an altermagnet with zero net moment but a finite AHE. Reference: [1] Y. Guo, et al., Spin-split collinear antiferromagnets: A large-scale ab-initio study, Materials Today Physics, 32, 100991 (2023) [2] T. Sato, et al., Altermagnetic anomalous Hall effect emerging from electronic correlations, Phys. Rev. Lett. 133, 086503 (2024) [3] O. Gomonay, et al., Structure, control, and dynamics of altermagnetic textures, npj Spintronics 2, 35 (2024) [4] C. Li, et al., Topological Weyl Altermagnetism in CrSb, Communications Physics 8, 311 (2025)