Dresden 2026 – scientific programme

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HL: Fachverband Halbleiterphysik

HL 3: 2D Materials I – Excitonic properties

HL 3.1: Talk

Monday, March 9, 2026, 09:30–09:45, POT/0081

Exciton-Electron Complexes in Multilayer Transition-Metal Dichalcogenides — •Florian Hirsch¹, Alexandra Hübler¹, Jonas von Milczewski², and Richard Schmidt¹ — ¹Institute for Theoretical Physics, Heidelberg University, Philosophenweg 16, 69120 Heidelberg, Germany — ²Department of Physics, Harvard University, Cambridge, Massachusetts 02138, USA

Understanding few-body correlations in van der Waals heterostructures is essential for uncovering emergent electronic phases in layered quantum materials. We report recent progress in identifying exciton-electron-electron bound states in multilayer transition-metal dichalcogenides (TMDs). Starting from the two-body problem, we employ complementary theoretical approaches to characterize bound states and systematically extend this framework to the four-body regime. Within an effective-mass model, we solve the resulting few-body Hamiltonians using exact diagonalization, enabling efficient exploration of material and geometric parameters. This allows us to map out regimes in which such exciton-electron complexes become bound. Our results provide a versatile framework for investigating exciton-mediated correlations in complex multilayer TMD structures and related systems, including platforms where exciton-induced electron pairing or superconductivity may emerge.

Keywords: Exciton-Electron interaction; Bound States; Transition-Metal Dichalcogenides