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A framework for multiexcitonic logic

Nature Reviews Chemistry volume 8, pages 136–151 (2024)Cite this article

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Abstract

Exciton science sits at the intersection of chemical, optical and spin-based implementations of information processing, but using excitons to conduct logical operations remains relatively unexplored. Excitons encoding information could be read optically (photoexcitation–photoemission) or electrically (charge recombination–separation), travel through materials via exciton energy transfer, and interact with one another in stimuli-responsive molecular excitonic devices. Excitonic logic offers the potential to mediate electrical, optical and chemical information. Additionally, high-spin triplet and quintet (multi)excitons offer access to well defined spin states of relevance to magnetic field effects, classical spintronics and spin-based quantum information science. In this Roadmap, we propose a framework for developing excitonic computing based on singlet fission (SF) and triplet–triplet annihilation (TTA). Various molecular components capable of modulating SF/TTA for logical operations are suggested, including molecular photo-switching and multi-colour photoexcitation. We then outline a pathway for constructing excitonic logic devices, considering aspects of circuit assembly, logical operation synchronization, and exciton transport and amplification. Promising future directions and challenges are identified, and the potential for realizing excitonic computing in the near future is discussed.

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Fig. 1: Excitonic materials can host logical operations.
Fig. 2: Triplet–triplet annihilation on a tetracene dimer as an excitonic AND gate.
Fig. 3: Methods of exerting logical control over multiexcitonic processes.
Fig. 4: Model architecture for multiexcitonic logic in a mixed singlet/triplet exciton basis.
Fig. 5: Directional ‘excitonic wires’ could conduct excitons from an output of one device to an input of another device.

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Acknowledgements

This work was supported by the Australian Research Council Centre of Excellence in Exciton Science (CE170100026). R.J.H. thanks N. Ekins-Daukes, K. Ghiggino and A. Manian for discussions that contributed to the development of this work.

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Author notes

  1. These authors contributed equally: Rohan J. Hudson and Thomas S. C. MacDonald.

Authors and Affiliations

  1. School of Chemistry, University of Melbourne, Melbourne, Victoria, Australia

    Rohan J. Hudson & Trevor A. Smith

  2. Australian Research Council Centre of Excellence in Exciton Science https://excitonscience.com/

    Rohan J. Hudson, Thomas S. C. MacDonald, Jared H. Cole, Timothy W. Schmidt, Trevor A. Smith & Dane R. McCamey

  3. School of Physics, UNSW Sydney, Sydney, New South Wales, Australia

    Thomas S. C. MacDonald & Dane R. McCamey

  4. School of Science, RMIT University, Melbourne, Victoria, Australia

    Jared H. Cole

  5. School of Chemistry, UNSW Sydney, Sydney, New South Wales, Australia

    Timothy W. Schmidt

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Contributions

T.S.C.M., J.H.C., T.W.S., T.A.S. and D.R.McC. conceived the initial ideas for this work. R.J.H., T.S.C.M. and J.H.C. conducted research and wrote the article. All authors contributed to discussion of content, reviewing and editing of the article.

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Correspondence to Dane R. McCamey.

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Hudson, R.J., MacDonald, T.S.C., Cole, J.H. et al. A framework for multiexcitonic logic. Nat Rev Chem 8, 136–151 (2024). https://doi.org/10.1038/s41570-023-00566-y

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