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Rydberg exciton-polaritons in a Cu2O microcavity.

Konstantinos Orfanakis1, Sai Kiran Rajendran1, Valentin Walther2,3

  • 1SUPA, School of Physics and Astronomy, University of St Andrews, St Andrews, UK.

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Researchers achieved strong coupling of light to Rydberg excitons in cuprous oxide (Cu2O) microcavities. This breakthrough enables the creation of Rydberg exciton-polaritons, paving the way for novel solid-state quantum technologies.

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Area of Science:

  • Solid-state physics
  • Quantum optics
  • Materials science

Background:

  • Giant Rydberg excitons, with diameters up to 1 μm, have been observed in cuprous oxide (Cu2O).
  • These large excitons offer enhanced interactions, crucial for developing strongly correlated solid-state platforms.
  • Rydberg exciton-polaritons, formed by coupling excitons to cavity photons, are a promising avenue, but achieving strong coupling has been challenging.

Purpose of the Study:

  • To achieve strong coupling between Rydberg excitons and cavity photons in a Cu2O microcavity.
  • To demonstrate the formation of Rydberg exciton-polaritons in this system.
  • To explore the potential for scalable, strongly correlated solid-state platforms.

Main Methods:

  • Embedding a thin Cu2O crystal into a Fabry-Pérot microcavity.
  • Utilizing optical spectroscopy to probe exciton-photon interactions.
  • Achieving strong coupling regime for Rydberg excitons up to n=6.

Main Results:

  • Demonstrated strong coupling of light to Cu2O Rydberg excitons up to the principal quantum number n=6.
  • Successfully formed Cu2O Rydberg exciton-polaritons.
  • Observed significant enhancements in excitonic interactions due to giant exciton dimensions.

Conclusions:

  • The study successfully achieved strong coupling of Rydberg excitons in Cu2O, forming exciton-polaritons.
  • This work provides a pathway towards scalable, strongly correlated solid-state systems.
  • The findings open possibilities for exploring novel quantum phenomena using light on a chip.