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Topologically enhanced exciton transport.

Joshua J P Thompson1, Wojciech J Jankowski2, Robert-Jan Slager2,3

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|December 13, 2025
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Summary
This summary is machine-generated.

Topological excitons significantly boost exciton diffusion in semiconductors, enhancing optoelectronic device performance. This discovery offers a new strategy for designing advanced solar cells and photodetectors.

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Quantum Mechanics

Background:

  • Excitons are crucial for optoelectronic response but their transport often limits device efficiency.
  • Exciton diffusion mechanisms include free, phonon-limited, and polaronic transport, influenced by time scale and host material.

Purpose of the Study:

  • To demonstrate enhanced exciton diffusion in topological excitons across various transport regimes.
  • To explore the role of quantum geometry in promoting topological exciton diffusion.
  • To propose experimental methods for probing exciton quantum geometry.

Main Methods:

  • Theoretical modeling using quantum geometry to analyze exciton properties.
  • Application of the theory to organic polyacene semiconductors.
  • Proposal of using non-uniform electric fields to probe exciton quantum metric.

Main Results:

  • Topological excitons exhibit enhanced diffusion compared to trivial excitons.
  • Quantum geometry reveals topological excitons are larger and more dispersive, facilitating diffusion.
  • Exciton transport increased up to fourfold in organic polyacenes with topological excitons.

Conclusions:

  • Topological excitons offer a novel strategy for enhancing exciton transport in semiconductors.
  • Topology and quantum geometry are key ingredients for designing next-generation optoelectronic devices.
  • Non-uniform electric fields can serve as a tool to experimentally probe exciton quantum geometry.