Proceedings of MATSUS Fall 2023 Conference (MATSUSFall23)
DOI: https://doi.org/10.29363/nanoge.matsus.2023.255
Publication date: 18th July 2023
Our recent works,1,2 along with the reports of few other groups from Columbia University3 and MIT4–6 shed a new light on a hybrid quantum well material platform based on metal organic chalcogenides (MOCs) that allow the manipulation of stable 2D Wannier-type excitons at room temperature, in a bulk solid.
Layered metal organic chalcogenides (MOCs) with molecular formula [MEPh]∞ (with M metal, and E chalcogen) form hybrid multi-quantum-well nanostructures. These materials can host tightly bound 2D excitons in a 3D crystal. MOCs show high optoelectronic quality, they are chemically tunable, and may therefore offer an air-stable alternative to the moisture-sensitive layered (so-called “2D”) metal halide perovskites in future optoelectronic applications.
A key aspect of hybrid inorganic-organic material systems is that their “soft” lattice structures render the excitonic properties particularly susceptible to exciton-phonon interactions. In this talk, I will present an investigation of the complex optical transitions of the prototypical MOC [AgSePh]∞. We visualized the excitons dynamics with transient absorption spectroscopy whose temporal oscillations reveal coherent exciton-phonon coupling. Steady state absorption and Raman spectroscopies revealed a strong exciton-phonon coupling and its anharmonicity, manifested as a nontrivial temperature-dependent Stokes shift. Our work highlight the general importance of exciton coupling to optical phonons hybrid quantum wells and it finally suggests that the peculiar spatial symmetry of the excitonic states and phonon modes needs to be accounted for in a proper treatment of exciton−phonon coupling.7
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