Regensburg 2025 – wissenschaftliches Programm

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SYSD: Symposium SKM Dissertation Prize 2025

SYSD 1: SKM Dissertation Prize Symposium

SYSD 1.3: Hauptvortrag

Montag, 17. März 2025, 10:30–11:00, H2

Aspects and Probes of Strongly Correlated Electrons in Two-Dimensional Semiconductors — •Clemens Kuhlenkamp — Harvard University, Cambridge, USA

Due to their high level of control two-dimensional (2D) materials are emerging as fascinating platforms to explore correlated electronic phases of matter. In this talk, I will discuss opportunities to control, prepare, and probe exotic states in structures of transition metal dichalcogenides (TMDs), a class of 2D semiconductors. Remarkably, already a single TMD layer can reach an interaction-dominated regime upon doping electrons. By analyzing the optical response of the material, we directly reveal the formation and properties of an electronic Wigner crystal—a state where electrons break translational symmetry by arranging in a triangular lattice. Moving on to multi-layer TMDs, I will demonstrate how Moiré patterns—arising from misalignments between the layers—can realize highly tunable, frustrated Hubbard models in the presence of large magnetic fields. Our theoretical analysis predicts that such materials can exhibit exotic insulator-to-insulator transitions and give rise to exceptionally robust spin liquid phases in the Mott insulating limit. I will conclude with an outlook on future directions, particularly highlighting opportunities to realize unconventional superconductivity.

Keywords: Strongly correlated electrons; Spin liquids; Two-dimensional materials; Critical phenomena