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MA: Fachverband Magnetismus

MA 29: Spin-Dependent Phenomena in 2 D

MA 29.15: Vortrag

Mittwoch, 20. März 2024, 18:45–19:00, EB 202

Emergent altermagnetism: magnetically induced anomalous Hall conductivity — •Toshihiro Sato¹, Sonia Haddad², Ion Cosma Fulga¹, Fakher F. Assaad^3,4, and Jeroen van den Brink^1,4,5 — ¹Institute for Theoretical Solid State Physics, IFW Dresden, Germany — ²Laboratoire de Physique de la Matière Condensée, Faculté des Sciences de Tunis, Université Tunis El Manar, Tunisia — ³Institut für Theoretische Physik und Astrophysik, Universität Würzburg, Germany — ⁴Würzburg-Dresden Cluster of Excellence ct.qmat, Germany — ⁵Institut für Theoretische Physik, Technische Universität Dresden, Germany

We introduce a novel model that demonstrates the emergence of altermagnetism driven by electron interactions. This model is grounded in a spin-full modified Haldane framework, where electron interactions play a crucial role. Employing quantum Monte Carlo simulations, we successfully demonstrate the emergence of an altermagentic phase. This phase exhibits spontaneously time-reversal symmetry-broken antiferromagnetic order and is characterized by spin-split bands without a net magnetic moment. Moreover, a significant observation is the simultaneous emergence of an anomalous quantum Hall order alongside this antiferromagnetic order. The concurrent appearance of both orders results in a measurable, finite anomalous Hall conductivity.

Keywords: Altermagnetism; Electron Interactions; Antiferromagnetic Order; Anomalous Hall Effect; Quantum Monte Carlo Simulations