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Scattering And Absorption of Light in Planetary Regoliths
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Spatiotemporal dynamics of scattering exceptional points.

Yu Xiao1, Zhiyuan Che1,2,3, Lei Shi4,5,6,7

  • 1Institute of Acoustics, School of Physics Science and Engineering, Tongji University, Shanghai, China.

Nature Communications
|July 7, 2026
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Summary

Researchers reveal how exceptional points (EPs) in non-Hermitian systems create spatiotemporal vortices (STVs). This work connects topological properties of EPs to dynamic wave behavior for advanced wave control applications.

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Area of Science:

  • Physics
  • Wave Phenomena
  • Non-Hermitian Systems

Background:

  • Exceptional points (EPs) are critical in non-Hermitian systems, controlling wave-matter interactions.
  • Conventional EPs in Hamiltonians and scattering EPs in input-output responses show similar patterns, obscuring their topological richness.

Purpose of the Study:

  • To resolve spatiotemporal dynamics of EPs by treating scattering as an evolving process.
  • To establish a framework for spatiotemporal wave control by linking EP topology to dynamic wave topology.

Main Methods:

  • Developed a cross-domain mapping from momentum-frequency to space-time.
  • Projected unitary scattering matrices onto lower-dimensional subspaces.
  • Utilized a liquid-surface-wave platform to observe phenomena.

Main Results:

  • Connected static EPs to dynamic scattering singularities.
  • Imprinted EP topology onto wave packets as spatiotemporal vortices (STVs) with quantized topological charge.
  • Observed charge-1 and charge-2 STVs generated by distinct EPs in a single device.

Conclusions:

  • Demonstrated that EP topology can be imprinted into wave packets as STVs.
  • Established a novel framework linking fixed exceptional topology to dynamic wave topology.
  • Opened new avenues for spatiotemporal wave control using EPs.