Abstract
Abstract Two-dimensional semiconductors are considered intriguing materials for photonic applications, thanks to their stunning optical properties and the possibility to manipulate them at the nanoscale. In this review, we focus on transition metal dichalcogenides and low-dimensional hybrid organic-inorganic perovskites, which possess the same characteristics related to planar confinement of their excitons: large binding energies, wide exciton extension, and high oscillator strength. We describe their optoelectronic properties and their capability to achieve strong coupling with light, with particular attention to polariton-polariton interactions. These aspects make them very attractive for polaritonic devices working at room temperature, in view of the realization of all-optical logic circuits in low-cost and easy-to-synthesize innovative materials.
Highlights
Over the past decade, two-dimensional (2D) materials have triggered an impressive research effort covering several fields of study, ranging from chemistry to physics and biology.This review focuses on a class of 2D materials possessing relevant optical properties and, on 2D materials that have been used in systems showing strong light-matter coupling at room temperature
We have reported on recent developments in room-temperature strong coupling between excitons in 2D materials and confined optical modes
Thanks to the planar confinement of electrons and holes, excitons in materials such as transition metal dichalcogenide (TMD) MLs and hybrid organic-inorganic PVKs possess high oscillator strengths and large binding energies, which make them ideal candidates for roomtemperature polaritonics
Summary
Two-dimensional (2D) materials have triggered an impressive research effort covering several fields of study, ranging from chemistry to physics and biology. This review focuses on a class of 2D materials possessing relevant optical properties and, on 2D materials that have been used in systems showing strong light-matter coupling at room temperature Examples of such materials are transition metal dichalcogenide (TMD) monolayers (MLs) or hybrid organic-inorganic halide perovskites (PVKs). Non-linearities from very localized excitons ( called Frenkel excitons in contrast to the large Wannier-Mott excitons in GaAs QWs) observed until now for organic polaritons lead to a much smaller interaction constant gP of 10−3 μeV μm2 [24, 25] For all these reasons, materials with a 2D confinement of excitons such as PVK and TMD MLs are becoming an interesting platform to harness high polariton non-linearities at room temperature. We summarize the work that has been done on polaritons in 2D hybrid organic-inorganic PVKs
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