Dresden 2026 – wissenschaftliches Programm

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HL: Fachverband Halbleiterphysik

HL 6: Focus Session: Tunable Correlations in van der Waals Quantum Materials I (joint session TT/DS/HL)

HL 6.4: Topical Talk

Montag, 9. März 2026, 16:45–17:15, HSZ/0003

Faithful modeling of quantum geometry and electronic correlations in van der Waals heterostructures — •Ammon Fischer — Max Planck Institute for the Structure and Dynamics of Matter, Hamburg, Germany — Center for Computational Quantum Physics, Flatiron Institute, New York, NY 10010, USA

Moiré materials - twisted stacks of two-dimensional materials - bridge between two influential paradigms of condensed matter research: non-trivial quantum geometry and strong electron-electron interactions. In this talk, I will outline how the construction of faithful low-energy models and their successive treatment by state-of-the-art many-body techniques allows to resolve electronic order in moiré and non-moiré heterostructures from first principles. In twisted bilayers of WSe₂, functional renormalization group techniques allow to unravel the angle evolution of antiferromagnetic order and superconductivity in the crossover regime from weak-to-moderate interactions. In rhombohedral multilayer graphenes, the low-energy theory is naturally described in terms of supercell Wannier functions that span the effective U(4) × U(4) subspace of the spin, valley and layer degrees of freedom. Electronic correlations give rise to various iso-spin ordered regimes, superconductivity and charge density wave order at low electronic densities bridging to the physics of their twisted counterparts.

Keywords: Twisted Materials; Strongly Correlated Electrons; Topological Superconductors; Functional Renormalization Group