Berlin 2024 – scientific programme
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O: Fachverband Oberflächenphysik
O 31: Poster: Organic Molecules on Inorganic Substrates
O 31.17: Poster
Tuesday, March 19, 2024, 18:00–20:00, Poster C
Collective States in 2D Molecular Monolayers — •Sabrina Juergensen1, Moritz Kessens1, Charlotte Berrezueta-Palacios1, Nikolai Severin2, Sumaya Ifland2, Jürgen P. Rabe2, Niclas S. Mueller3, and Stephanie Reich1 — 1Freie Universität Berlin, Berlin, Germany — 2Humboldt Universität zu Berlin, Berlin, Germany — 3NanoPhotonics Centre - University of Cambridge, Cambridge, UK
Organic monolayer crystals have emerged as a new material to replace conventional semiconductors like silicon or TMDs and have become a wide research area in recent years. Mostly these 2D materials are grown out of dye molecules that tend to form J-aggregates leading to outstanding optical properties. In J-aggregates the dipole moments of the molecules are aligned resulting in a strong coupling of the molecules, forming a collective state. The photonic excitation of the collective states to higher electronic levels will result in a very narrow and strong emission also known as superradiance.
To study the collective state in an 2D material in dependency of the dielectric environment, we grew monolayers of a perylene derivative on two different van der Waals materials with different electronic properties, providing a perfect platform to study the fundamental mechanism of the collective state. High resolution AFM was used to determine the packing density of the molecules in a monolayer. Different optical methods were used to characterize the collective state of the molecular monolayer. The experimental data were further compared to real space simulations.
Keywords: Collective State; MePTCDI; Monolayer; Superradiance