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Hydrodynamic moiré superlattice.

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Researchers created periodic vortices in fluids, forming a moiré superlattice. They observed energy delocalization and localization phenomena, demonstrating moiré physics in hydrodynamic metamaterials for potential control over energy and mass transport.

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Area of Science:

  • Fluid dynamics
  • Condensed matter physics
  • Metamaterials

Background:

  • Photonic crystals exhibit structural periodicity crucial for topological and moiré physics.
  • Low shear modulus in fluids hinders the creation of stable spatial periodicity comparable to photonic crystals.
  • Hydrodynamic metamaterials offer a potential platform for realizing tunable fluidic structures.

Purpose of the Study:

  • To investigate the possibility of creating and controlling spatial periodicity in fluids.
  • To explore moiré phenomena in fluidic systems by stacking and twisting periodic vortex structures.
  • To understand energy delocalization and localization dynamics within fluidic moiré superlattices.

Main Methods:

  • Fabrication of periodic vortices in hydrodynamic metamaterials.
  • Construction of a bilayer moiré superlattice by stacking and twisting two vortex fluid layers.
  • Analysis of energy transport phenomena under varying twist angles and lattice configurations.

Main Results:

  • Successfully realized periodic vortices in hydrodynamic metamaterials, forming a fluidic moiré superlattice.
  • Observed distinct energy delocalization and localization behaviors corresponding to Pythagorean and non-Pythagorean triples in twist angles.
  • Reported anomalous energy localization in commensurate moiré fluids with large lattice constants satisfying Pythagorean triples.

Conclusions:

  • Demonstrated the emergence of moiré phenomena in fluid systems, challenging previous limitations.
  • Established a novel method for controlling energy transfer, mass transport, and particle navigation using fluidic moiré superlattices.
  • Opened new avenues for manipulating fluid dynamics and energy transport through engineered vortex interactions.