Regensburg 2025 – scientific programme
Parts | Days | Selection | Search | Updates | Downloads | Help
MA: Fachverband Magnetismus
MA 13: Altermagnets II
MA 13.5: Talk
Tuesday, March 18, 2025, 10:30–10:45, H20
Ferro-spinetic altermagnetic insulators from electronic correlations — •Toshihiro Sato1,2, Ion Cosma Fulga1,2, Fakher F. Assaad3,2, and Jeroen van den Brink1,2 — 1Institute for Theoretical Solid State Physics, IFW Dresden, Germany — 2Würzburg-Dresden Cluster of Excellence ct.qmat, Germany — 3Institut für Theoretische Physik und Astrophysik, Universität Würzburg, Germany
While altermagnets are a class of fully compensated antiferromagnets lacking combined time-reversal and translational symmetry, their symmetry allows for unique polarization phenomena when inversion symmetry is broken. In this talk, we introduce an interacting fermion model with emergent ferro-spinetic polarizations in altermagnetic insulators - a spin analog to ferroelectricity. This model is grounded in a two-dimensional Hubbard framework incorporating inversion symmetry-breaking elements. Quantum Monte Carlo simulations demonstrate an altermagnetically ordered state with broken inversion symmetry driven by electron correlations, where spin-up and spin-down polarizations accumulate on opposite edges, with their directions reversibly controlled by the inversion symmetry-breaking factor. While the system retains electron-hole symmetry, resulting in zero ferroelectric charge polarization, breaking this symmetry induces the charge polarization orthogonal to the spin polarization.
Keywords: Altermagnets; Theoretical Interacting Fermion Model; Electron Correlations; Quantum Monte Carlo Simulations; Polarizations