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Deterministic Double-Zero Media and Robust Wave Manipulation Using a Phononic Weyl Semimetal.

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This study introduces a topological approach to create robust directional double-zero media. These metamaterials offer stable, impedance-independent wave manipulation, overcoming limitations of previous designs.

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Area of Science:

  • Condensed matter physics
  • Metamaterials science
  • Topology in physics

Background:

  • Double-zero media offer unique impedance-independent wave manipulation.
  • Accidental degeneracy in these media leads to fragility against structural and material variations.

Purpose of the Study:

  • To develop a robust, topology-protected directional double-zero medium.
  • To overcome the fragility of conventional double-zero media.

Main Methods:

  • Constructing a Weyl semimetal with uniaxial screw symmetry.
  • Utilizing a charge-2 Weyl point at the Brillouin zone center.
  • Experimental realization and characterization of the proposed Weyl semimetal.

Main Results:

  • Demonstrated a deterministic directional double-zero medium with linear and quadratic dispersion.
  • Achieved impedance-independent total transmission and divergent impedance mismatch.
  • Observed frequency-tunable wave collimation and configurable positive/negative refraction.

Conclusions:

  • The topological Weyl semimetal provides a robust platform for directional double-zero media.
  • This approach enables unprecedented control over bulk-wave manipulation.
  • Opens new avenues for topology-protected metamaterials.