Condensed Matter Physics in the Alps: Geometric Frustration, Topology, Flat Bands, and Correlation in Kagome and Van der Waals Systems

Session

Wednesday Morning Session I, Chair A. Balatsky

7 Jan 2026, 08:30

Saas Fee

54. Orbital magnetism and flat bands in magnetic field

Oskar Vafek (William I. Fine Theoretical Physics Institute, University of Minnesota)

07/01/2026, 08:30

Theory

Invited talk (by invitation only)

I will discuss recent theoretical progress in understanding the role played by the electron-electron interactions in orbital magnetism, and highlight results obtained for the flat bands of the magic angle twisted bilayer graphene, as well as for some twisted transition metal dichalcogenides. I will also discuss the effect of the external out-of-plane magnetic field on the correlated ground...

55. Kinetic magnetism in triangular lattices

Eugene Demler (ETH Zurich)

07/01/2026, 09:05

Theory

Invited talk (by invitation only)

This talk will review kinetic magnetism in the Fermi Hubbard model in triangular lattices. Focus will be on the regime of strong interactions, $t<<U$. In such systems for densities close to $n=1$ dominant magnetic interactions arise from magnetic polaron dressing of charge carrier propagating in a spin incoherent Mott insulator. In the case of hole doping, antiferromagnetic polarons originate...