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SYWS: Symposium Quantum 2D-Moiré and Rhombohedral van-der-Waals Systems

SYWS 1: Quantum 2D-Moiré and Rhombohedral van-der-Waals Systems

SYWS 1.4: Invited Talk

Thursday, September 11, 2025, 12:15–12:45, ZHG008

Electron Correlations in Moiré vs. Moiréless Quantum Matter — •Tim Wehling — I. Institute of Theoretical Physics, University of Hamburg, 22607 Hamburg, Germany — The Hamburg Centre for Ultrafast Imaging, 22761 Hamburg, Germany

Understanding and controlling electron correlations in quantum matter remains a central challenge in materials science. In recent years, a wide range of novel correlated states has been discovered through the precise stacking and twisting of two-dimensional van der Waals materials. These stacked structures uniquely give rise to correlated phases that are not predictable from the properties of the individual layers alone.

In this talk, we compare electron correlations, as well as spin, valley, and superconducting order, in twisted graphene systems [1, 2] and twisted transition metal dichalcogenide multilayers [3] with those in moiréless systems - i.e., non-twisted graphene multilayers [4], doped fullerides [5], and functionalized graphene, where correlations arise at the atomic scale [6]. We discuss how multi-orbital physics, flat bands, and quantum geometry govern the emergence of electronic phases in these systems.

[1] G. Rai et al., Phys. Rev. X 14, 031045 (2024).

[2] H. Hu et al., Phys. Rev. Lett. 131, 166501 (2023).

[3] A. Fischer et al., arXiv:2412.14296.

[4] A. Fischer et al., Phys. Rev. Res. 6, L012003 (2024).

[5] N. Witt et al., Npj Quantum Mater. 9, 1 (2024).

[6] N. Witt et al., arXiv:2503.03700.

Keywords: Electron correlations; Moiré; Superconductivity