Proceedings of Online nanoGe Fall Meeting 20 (OnlineNFM20)
Publication date: 4th October 2020
Abstract: Biexcitons in 2D transition metal dichalcogenide from first principle: binding energies and fine structure.
The emerging field of 2-dimensional (2D) materials keeps gaining increasing attention due to the wide range of potential applications in many domains including: optoelectronics, photovoltaic, sensing, quantum computing ...etc. Reducing the dimensionality of a system results in an enhancement of the Coulomb interaction between elementary quasiparticles (i.e. electrons and holes) as it reduces the dielectric screening. This allows for the formation of strongly bounded excitations which can be observed even at room temperature. Among these excitations, biexcitons are of special interest from both the experimental and theoretical perspectives due to its rich physics and potential applications in quantum information and lasing [1]. Understanding biexcitons would be the first step toward a clear understanding of the equilibrium dynamics of photo excited hot carriers and is also relevant in the context of exciton condensation. Moreover, the biexciton, being a complex bound state of 2 electrons and 2 holes, has a rich fine structure and many more degrees of freedom than the simple excitonic case.
First principle treatment of biexcitons, on the same theoretical footing as excitons and trions, is possible thanks to the newly developed methodology of Ref. [2]which uses a hybrid approach combining configuration interaction and green function methods for the description of many-electron many-hole excitations.This methodology has been shown to give reliable results on excitons and trions [2] and it is applied here to study the binding, fine structure and non-equilibrium effects of biexcitons in 2D transition metal dichalcogenide.
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