JCMS: Kinetic magnetism as a mediator of strong inter-carrier attraction in moiré flat bands

by Johan Carlström (KTH)

Monday 20 Oct 2025, 11:00 → 12:00 Europe/Stockholm

Albano 3: 6228 - Mega (22 seats) (Albano Building 3)

Speaker: Johan Carlström (KTH)

Abstract: The doped Mott insulator, where charge carriers propagate against a spin background, serves as a paradigmatic model for strongly correlated electronic systems. In this framework, two fundamental energy scales emerge: the kinetic energy, stemming from the delocalisation of charge carriers, and the magnetic energy, driven by super-exchange processes that promote antiferromagnetic order. When the onsite repulsion is strong, super-exchange is suppressed, and spin correlations are predominantly governed by delocalisation—a phenomenon known as kinetic magnetism.
   In this talk, I will provide a concise introduction to this captivating topic, highlighting recent experimental advances, including those involving moiré materials. I will also discuss my own research, which investigates how kinetic magnetism can mediate attraction between charge carriers, and I will relate these findings to recent experimental observations.