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Complete absorption of topologically protected waves.

Guido Baardink1, Gino Cassella1, Luke Neville1

  • 1Department of Physics, University of Bath, Claverton Down, Bath BA2 7AY, England, United Kingdom.

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Summary
This summary is machine-generated.

Topological chiral edge states can trap energy at interfaces. This study demonstrates how this mode trapping enhances energy dissipation, offering new applications in acoustic absorption and soundproofing.

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Area of Science:

  • Topological physics
  • Fluid dynamics
  • Acoustics

Background:

  • Chiral edge states offer robust energy transport along interfaces, protected by bulk-boundary correspondence.
  • In continuum systems, interface states can be sensitive to boundary conditions, affecting energy transmission.

Purpose of the Study:

  • To design interfaces that trap energy by creating a net flux of modes into a region.
  • To investigate the interplay between topology, non-Hermiticity, and energy dissipation in topological fluids.
  • To explore potential applications of topological mode trapping in acoustics.

Main Methods:

  • Developing a model system of two counter-spinning topological fluids.
  • Introducing a boundary transitioning from a fluid-fluid interface to a no-slip wall.
  • Solving fluid equations of motion to derive explicit expressions for disappearing chiral edge states.

Main Results:

  • Chiral edge states disappear at the designed interface, indicating non-Hermiticity.
  • Mode trapping leads to enhanced energy dissipation.
  • Explicit expressions for disappearing modes were derived from fluid dynamics.

Conclusions:

  • Topology can be exploited to control energy dissipation, not just transmission.
  • The findings suggest applications in acoustic absorption, shielding, and soundproofing.
  • Mode trapping by topological interfaces offers a novel mechanism for energy dissipation.