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Hydrodynamic moiré superlattice.
Guoqiang Xu1, Xue Zhou2, Weijin Chen1
1Department of Electrical and Computer Engineering, National University of Singapore, Kent Ridge, Singapore, Republic of Singapore.
Science (New York, N.Y.)
|December 19, 2024
Summary
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.
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.
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