Regensburg 2025 – scientific programme
Parts | Days | Selection | Search | Updates | Downloads | Help
TT: Fachverband Tiefe Temperaturen
TT 3: Correlated Magnetism – General
TT 3.9: Talk
Monday, March 17, 2025, 11:45–12:00, H32
Altermagnetism from interaction-driven itinerant magnetism — Samuele Giuli1, •Carlos Mejuto-Zaera1,2, and Massimo Capone1,3 — 1International School for Advanced Studies (SISSA), Trieste, Italy — 2Current: Laboratoire de Physique Théorique (LPT), Toulouse, France — 3CNR-IOM Democritos, Trieste, Italy
Altermagnetism is a phase of collinear spin-ordering presenting anisotropic magnetic properties, leading to great interest in its potential application for spintronic and thermoelectric devices. Realizing this promise will likely hinge on the design of tunable altermagnetic platforms, in which the magnetic and electric responses can be reliably controlled. A viable path towards this goal concerns leveraging electron interactions for the stabilization of altermagnetism, a strategy which is developing increasing traction in the field. In this work, we propose a mechanism driven by the interplay between a local Hubbard repulsion and the presence of a van Hove singularity in a two-band model. Here, the itinerant magnetism caused by the van Hove singularity colludes with the exchange mechanism driven by the Hubbard repulsion to generate an altermagnetic state in a sizeable portion of the phase diagram. Importantly, this correlated altermagnetic phase exhibits a tuneable spin-current, whose sign can be changed by tuning the interaction strength and/or particle doping. We study the role of strong electronic correlations in the stabilization of this phase by leveraging on the ghost rotationally invariant slave boson embedding. Further, we comment on the stability of the phase, and potential material realizations.
Keywords: Altermagnetism; Strong Correlation; Gutzwiller Ansatz; Quantum Embedding; Rotational Invariant Slave Boson