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Cavity-QED-controlled two-dimensional Moiré excitons without twisting.

Francesco Troisi1, Hannes Hübener2, Angel Rubio3,4

  • 1Max Planck Institute for the Structure and Dynamics of Matter and Center for Free-Electron Laser Science, Hamburg, Germany. francesco.troisi@mpsd.mpg.de.

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|December 24, 2025
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Summary
This summary is machine-generated.

We demonstrate all-optical Moiré-like exciton confinement using periodic optical cavities. This approach controls material properties by coupling excitations to photons, emulating Moiré physics and enabling novel cavity material engineering.

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Area of Science:

  • Quantum optics
  • Condensed matter physics
  • Materials science

Background:

  • Periodic photonic structures can influence material properties by coupling matter excitations to confined photons.
  • Understanding exciton-photon interactions is crucial for developing advanced optical materials.

Purpose of the Study:

  • To propose and theoretically describe an all-optical method for Moiré-like exciton confinement.
  • To investigate the role of quantum electrodynamics in cavity-mediated exciton behavior.
  • To explore the potential of spatially structured cavities for materials engineering.

Main Methods:

  • Development of a low-energy, non-perturbative quantum electrodynamical (QED) description.
  • Analysis of strongly coupled excitons and photons at finite momentum transfer.
  • Modeling of both laser-driven (classical) and dark (quantum fluctuation) cavity regimes.

Main Results:

  • Optical confinement in laser-driven cavities emulates Moiré physics.
  • Quantum fluctuations in dark cavities renormalize excitonic bands and effective mass.
  • Long-range cavity-mediated exciton-exciton interactions are identified as key, requiring non-perturbative treatment.

Conclusions:

  • Spatially periodic optical cavities offer a novel route for all-optical Moiré-like exciton confinement.
  • Cavity quantum electrodynamics provides essential insights into exciton behavior and interactions.
  • This work proposes cavity material engineering as a promising avenue for controlling quantum material properties.