Proceedings of nanoGe Fall Meeting 2018 (NFM18)
DOI: https://doi.org/10.29363/nanoge.nfm.2018.249
Publication date: 6th July 2018
One important feature of two-dimensional semiconductors (e.g., transition metal
dichalcogenide monolayers or phosphorene) is the strong Coulomb and Exchange interactions between photo-generated charge carriers resulting from the unusual carrier screening and its environmental sensitivity. Particular interesting is the formation of bound states involving multiple carriers, such as positively and negatively charged trions (3 particles), biexcitons and more. The low screening situation leads to quasiparticles that can remain stable even near-room temperature. I will address the corresponding situation describe some of the atomistic theoretical approaches available. En emphasis will be placed on the effects of the environment on the quasiparticle binding energies (exciton binding energies and the shift of exciton transitions relative to trions and biexcitons). Empirical theoretical approaches will be contrasted to more ab-initio descriptions, which still suffer from the high computational demand. Finally, the results will be compared to —the rather well established— situation in semiconductor quantum dots where screening effects tend to be rather well described by bulk screening.
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