Charge-tuneable biexciton complexes in monolayer WSe2

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

doi:10.1038/s41467-018-05632-4

Charge-tuneable biexciton complexes in monolayer WSe₂

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

^*Corresponding author for this work

Chemistry

Research output: Contribution to journal › Article › peer-review

212 Scopus citations

Abstract

Monolayer transition metal dichalcogenides have strong Coulomb-mediated many-body interactions. Theoretical studies have predicted the existence of numerous multi-particle excitonic states. Two-particle excitons and three-particle trions have been identified by their optical signatures. However, more complex states such as biexcitons have been elusive due to limited spectral quality of the optical emission. Here, we report direct evidence of two biexciton complexes in monolayer tungsten diselenide: the four-particle neutral biexciton and the five-particle negatively charged biexciton. We distinguish these states by power-dependent photoluminescence and demonstrate full electrical switching between them. We determine the band states of the elementary particles comprising the biexcitons through magneto-optical spectroscopy. We also resolve a splitting of 2.5 meV for the neutral biexciton, which we attribute to the fine structure, providing reference for subsequent studies. Our results unveil the nature of multi-exciton complexes in transitionmetal dichalcogenides and offer direct routes towards deterministic control in many-body quantum phenomena.

Original language	English (US)
Article number	3721
Journal	Nature communications
Volume	9
Issue number	1
DOIs	https://doi.org/10.1038/s41467-018-05632-4
State	Published - Dec 1 2018

Funding

The authors thank Bernhard Urbaszek, Neil D. Drummond, Vladimir I. Fal’ko and Ioannis Paradisanos for useful discussions. We acknowledge funding from NSF DMR-1552220, Elemental Strategy Initiative conducted by the MEXT, Japan and the CREST (JPMJCR15F3), JST, EU Graphene Flagship, ERC Grants Hetero2D and PHOENICS, EPSRC Grants EP/509K01711X/1, EP/K017144/1, EP/N010345/1, EP/M507799/ 5101, and EP/L016087/1, Marie Skłodowska-Curie Actions Spin-NANO, Grant No. 676108, Quantum Technology Hub NQIT EP/M013243/1.

ASJC Scopus subject areas

General Chemistry
General Biochemistry, Genetics and Molecular Biology
General Physics and Astronomy

Access to Document

10.1038/s41467-018-05632-4

Cite this

Barbone, M., Montblanch, A. R. P., Kara, D. M., Palacios-Berraquero, C., Cadore, A. R., De Fazio, D., Pingault, B., Mostaani, E., Li, H., Chen, B., Watanabe, K., Taniguchi, T., Tongay, S., Wang, G., Ferrari, A. C., & Atatüre, M. (2018). Charge-tuneable biexciton complexes in monolayer WSe₂ Nature communications, 9(1), Article 3721. https://doi.org/10.1038/s41467-018-05632-4

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title = "Charge-tuneable biexciton complexes in monolayer WSe2 ",

abstract = "Monolayer transition metal dichalcogenides have strong Coulomb-mediated many-body interactions. Theoretical studies have predicted the existence of numerous multi-particle excitonic states. Two-particle excitons and three-particle trions have been identified by their optical signatures. However, more complex states such as biexcitons have been elusive due to limited spectral quality of the optical emission. Here, we report direct evidence of two biexciton complexes in monolayer tungsten diselenide: the four-particle neutral biexciton and the five-particle negatively charged biexciton. We distinguish these states by power-dependent photoluminescence and demonstrate full electrical switching between them. We determine the band states of the elementary particles comprising the biexcitons through magneto-optical spectroscopy. We also resolve a splitting of 2.5 meV for the neutral biexciton, which we attribute to the fine structure, providing reference for subsequent studies. Our results unveil the nature of multi-exciton complexes in transitionmetal dichalcogenides and offer direct routes towards deterministic control in many-body quantum phenomena.",

author = "Matteo Barbone and Montblanch, {Alejandro R.P.} and Kara, {Dhiren M.} and Carmen Palacios-Berraquero and Cadore, {Alisson R.} and {De Fazio}, Domenico and Benjamin Pingault and Elaheh Mostaani and Han Li and Bin Chen and Kenji Watanabe and Takashi Taniguchi and Sefaattin Tongay and Gang Wang and Ferrari, {Andrea C.} and Mete Atat{\"u}re",

note = "Publisher Copyright: {\textcopyright} 2018, The Author(s).",

year = "2018",

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Barbone, M, Montblanch, ARP, Kara, DM, Palacios-Berraquero, C, Cadore, AR, De Fazio, D, Pingault, B, Mostaani, E, Li, H, Chen, B, Watanabe, K, Taniguchi, T, Tongay, S, Wang, G, Ferrari, AC & Atatüre, M 2018, 'Charge-tuneable biexciton complexes in monolayer WSe₂ ', Nature communications, vol. 9, no. 1, 3721. https://doi.org/10.1038/s41467-018-05632-4

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AU - Barbone, Matteo

AU - Montblanch, Alejandro R.P.

AU - Kara, Dhiren M.

AU - Palacios-Berraquero, Carmen

AU - Cadore, Alisson R.

AU - De Fazio, Domenico

AU - Pingault, Benjamin

AU - Mostaani, Elaheh

AU - Li, Han

AU - Chen, Bin

AU - Watanabe, Kenji

AU - Taniguchi, Takashi

AU - Tongay, Sefaattin

AU - Wang, Gang

AU - Ferrari, Andrea C.

AU - Atatüre, Mete

PY - 2018/12/1

Y1 - 2018/12/1

N2 - Monolayer transition metal dichalcogenides have strong Coulomb-mediated many-body interactions. Theoretical studies have predicted the existence of numerous multi-particle excitonic states. Two-particle excitons and three-particle trions have been identified by their optical signatures. However, more complex states such as biexcitons have been elusive due to limited spectral quality of the optical emission. Here, we report direct evidence of two biexciton complexes in monolayer tungsten diselenide: the four-particle neutral biexciton and the five-particle negatively charged biexciton. We distinguish these states by power-dependent photoluminescence and demonstrate full electrical switching between them. We determine the band states of the elementary particles comprising the biexcitons through magneto-optical spectroscopy. We also resolve a splitting of 2.5 meV for the neutral biexciton, which we attribute to the fine structure, providing reference for subsequent studies. Our results unveil the nature of multi-exciton complexes in transitionmetal dichalcogenides and offer direct routes towards deterministic control in many-body quantum phenomena.

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