Exciton-exciton interaction is central to a broad range of many-body processes, such as Mott transition, exciton condensation, and exciton annihilation or the reverse process of exciton fission. Such many-body interactions are particularly strong in two-dimensional (2D) semiconductors due to the poorly screened Coulomb potential. In this talk, I will discuss our recent effort in understanding exciton-exciton interaction at the 2D limit. Using a range of model systems, including transition metal dichalcogenides monolayers and hetero-bilayers, I will discuss how the strong Coulomb interaction is manifested in many-body dynamics, including spin-valley specific scattering, Mott transitions, and exciton-exciton annihilations. I will also discuss the prospects of quantum fluid phases, such as exciton condensates and 2D superconductivity.

Exciton many body interactions in two-dimensional semiconductors

Macromolecular Chemistry: The Second Century

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ACS Spring 2020 National Meeting & Expo

The official archive and repository for all ACS Meetings & Expositions abstracts and select posters or presentations.