Exciton interactions in 1D and 2D systems
For exciton-exciton annihilation to occur, two excitons must interact with each other. These interactions are well-characterized for 1D and 2D systems. In a 1D system, we can think of exciton interactions occurring like schoolchildren talking on a bus. For example, exciton 4 can interact with its neighbors, exciton 3 or 5, but cannot interact with exciton 1 and 2 due to space constraint. In a 2D system, like schoolchildren in a playground, exciton 4 can now freely move in both dimensions, and can interact with any other exciton – for example, exciton 2 or 5. The scientists aim to find out how the interactions occur in phosphorene, a quasi-1D system.
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