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TT: Fachverband Tiefe Temperaturen

TT 18: Focus Session: Strongly Correlated Quantum States in Moiré Heterostructures (joint session TT/HL/MA)

TT 18.6: Talk

Tuesday, March 18, 2025, 12:15–12:30, H36

Theory for Optical Control of Correlated States in Moiré Transition Metal Dichalcogenide Heterostructures — •Haoyang Tian and Urban Friedrich Peter Seifert — Institut für Theoretische Physik, Universität zu Köln, Zülpicher Str. 77a, 50937 Köln, Germany

In recent years, moiré transition metal dichalcogenide (TMD) heterostructures have emerged as highly versatile platforms for investigating phases and phenomena of strongly correlated electrons on emergent lattice scales. However, experimental characterization of the precise nature of some interaction-driven long-range ordered states and their excitations has remained a challenge. Given strong light-matter couplings and valley selection rules in TMD materials, ultrafast optical methods may constitute a promising avenue for probing and controlling these states and their collective modes. In this work, we develop a theoretical framework to describe coherent light-matter interactions in moiré TMD heterostructures, and model the system's steady-state and non-equilibrium dynamics during and after photoexcitation with a laser pulse. Thus obtained characteristic signatures of the system's dynamics may allow for new experimental insights.

Keywords: Moiré transition metal dichalcogenides; Pump-probe spectroscopy; Magnetooptical effects