Charge-tuneable biexciton complexes in monolayer WSe2

Matteo Barbone; Alejandro R-P. Montblanch; Dhiren Kara; Carmen Palacios-Berraquero; Alisson Cadore; Domenico De Fazio; Benjamin Pingault; Elaheh Mostaani; Han Li; Bin Chen; Kenji Watanabe; Takashi Taniguchi; Sefaattin Tongay; Gang Wang; Andrea Ferrari; Mete Atature

doi:10.1038/s41467-018-05632-4

Journal article Charge-tuneable biexciton complexes in monolayer WSe2

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Matteo Barbone, Alejandro R-P. Montblanch, Dhiren Kara, Carmen Palacios-Berraquero, Alisson Cadore, Domenico De Fazio, Benjamin Pingault, Elaheh Mostaani, Han Li, Bin Chen, Kenji Watanabe, Takashi Taniguchi, Sefaattin Tongay, Gang Wang, Andrea Ferrari, Mete Atature. Charge-tuneable biexciton complexes in monolayer WSe2. NATURE COMMUNICATIONS. 2018, 9 (), 3721. https://doi.org/10.1038/s41467-018-05632-4

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We report experimental evidence of two fundamental biexciton complexes in insulated monolayer WSe2, namely the four-particle neutral biexciton and the five-particle negatively charged biexciton. We distinguish these states by power-dependent photoluminescence, and we demonstrate full switching between these two states by electrical control. We determine the original band states of the elementary particles comprising the biexcitons through magneto-optical spectroscopy. We also resolve a fine-structure splitting of 2.5 meV for the neutral biexciton emission, providing an essential reference for subsequent studies. Our results unveil the nature of the multi-particle exciton complexes in TMDs and offer direct routes to their deterministic control in many-body quantum phenomena.

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