Interface engineering of charge-transfer excitons in 2D lateral heterostructures

Roberto Rosati; Ioannis Paradisanos; Libai Huang; Ziyang Gan; Antony George; Kenji Watanabe; Takashi Taniguchi; Laurent Lombez; Pierre Renucci; Andrey Turchanin; Bernhard Urbaszek; Ermin Malic

Article Interface engineering of charge-transfer excitons in 2D lateral heterostructures

Roberto Rosati ; Ioannis Paradisanos ; Libai Huang ; Ziyang Gan ; Antony George ; Kenji Watanabe (National Institute for Materials Science) ; Takashi Taniguchi (National Institute for Materials Science) ; Laurent Lombez ; Pierre Renucci ; Andrey Turchanin ; Bernhard Urbaszek ; Ermin Malic

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Roberto Rosati, Ioannis Paradisanos, Libai Huang, Ziyang Gan, Antony George, Kenji Watanabe, Takashi Taniguchi, Laurent Lombez, Pierre Renucci, Andrey Turchanin, Bernhard Urbaszek, Ermin Malic. Interface engineering of charge-transfer excitons in 2D lateral heterostructures. Nature Communications. 2023, 14 (1), 2438.

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The existence of bound charge transfer (CT) excitons at the interface of monolayer lateral het- erojunctions has been debated in literature, but contrary to the case of interlayer excitons in ver- tical heterostructure their observation still has to be confirmed. Here, we present a joint theory- experiment study investigating signatures of bound CT excitons in photoluminescence spectra at the interface of hBN-encapsulated lateral MoSe2-WSe2 heterostructures. Based on a fully micro- scopic and material-specific theory, we reveal the many-particle processes behind the formation of CT excitons and how they can be tuned via interface- and dielectric engineering. For junction widths smaller than the Coulomb-induced Bohr radius we predict the appearance of a low-energy CT exciton. The theoretical prediction is compared with experimental low-temperature photolu- minescence measurements showing emission in the bound CT excitons energy range. Our joint theory-experiment study presents a significant step towards a microscopic understanding of optical properties of technologically promising 2D lateral heterostructures.

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