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Excitons in 2D Materials

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An exciton is a bound state of an electron and a hole, held together by the Coulomb force within a semiconductor, insulator, or other material. It represents a fundamental solid-state excitation. When host materials are thinned down to the monolayer level, fascinating excitonic phenomena emerge, such as the extremely large binding energies observed in various 2D transition metal dichalcogenides. More recently, pronounced coupling effects between excitons and magnons have been observed in 2D magnetic semiconductors, despite these two types of solid-state excitations differing in energy by several orders of magnitude. This coupling could enable previously inaccessible optical access to spin information and vice versa, offering exciting new avenues for research. Understanding the physics of excitons in 2D materials is therefore of significant interest to a wide range of researchers across semiconductor physics, magnetism, photonics, and materials science.

This collection welcomes the different scientific communities working on excitons in 2D materials to summarize their latest efforts and developments.

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