Title: Weak and strong coupling in heterostructures with 2D semiconductors

Speaker: Prof. Sylke Blumstengel, Humboldt-Universität zu Berlin, Germany

Abstract: Via integration of 2D semiconductors, such as transition metal dichalcogenides (TMDC), in heterostructures synergy effects are expected to arise from the coupling of the excitons in monolayer (1L) TMDCs with the excitations of a different material. In the talk I will discuss two cases: (1) strong coupling of 1L-WS2 excitons with surface plasmon polaritons (SPP) propagating in a thin silver film and (2) weak coupling between excitons in 1L-TMDCs (WS2 and MoS2) and organic dye molecules. In the latter case, the role of the energy level alignment at the heterointerface is highlighted to distinguish between exciton and single charge transfer at the heterointerface. The benefits arising from the coupling and examples for applications will be discussed.

References: (1) N. Zorn Morales et al. Phys. Rev. B 2023, 108, 165426.

(2) M. Roufi et al. phys. stat. sol. A 2024, 221, 2300107; N. Zorn Morales et al. Adv. Opt. Mater. 2023, 11, 2301057; M. Roufi et al. J. Phys. Chem. C 2023, 127, 5866; S. Park et al. ACS Nano 2021, 15, 14794; S. Park et al. Adv. Sci. 2021, 8, 2100215; N. Mutz et al. J. Phys. Chem. C 2020, 124, 2837.