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Fabricating van der Waals Heterostructures with Precise Rotational Alignment
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Synthetic Crystal Rotation with Spacetime Metamaterials.

Iñigo Liberal1, Alejandro Manjavacas2

  • 1Public University of Navarre, Department of Electrical, Electronic and Communications Engineering, Institute of Smart Cities, 31006 Pamplona, Spain.

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|April 25, 2026
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Summary
This summary is machine-generated.

Synthetic crystal rotations enable studying light-matter interactions at high frequencies. This research explores how these rotations alter light properties, leading to novel phenomena like frequency-SAM locking.

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Area of Science:

  • Optics and Photonics
  • Condensed Matter Physics
  • Electromagnetism

Background:

  • Traditional light-matter interactions are limited by low rotation frequencies.
  • Exploring high-frequency rotation effects is crucial for advanced optical applications.

Purpose of the Study:

  • Investigate light scattering by synthetic crystal rotations.
  • Understand the impact of spatiotemporal modulations on light-matter interactions.
  • Explore novel light-matter interaction regimes.

Main Methods:

  • Simulated synthetic crystal rotations using spatiotemporal modulations.
  • Analyzed the scattering of optical pulses by these synthetic structures.
  • Examined frequency-domain responses and spin angular momentum (SAM) changes.

Main Results:

  • Spatiotemporal modulations mimic high-frequency crystal rotations.
  • Observed conservation of combined energy and spin angular momentum (SAM).
  • Demonstrated intrapulse SAM changes and frequency-SAM locking in scattered light.
  • Identified negative frequency sideband transitions at high rotation frequencies.

Conclusions:

  • Synthetic rotations provide access to new light-matter interaction regimes.
  • Spatiotemporal modulations fundamentally alter electromagnetic field symmetries.
  • The findings pave the way for novel optical phenomena and technologies.