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Researchers created an acoustic system exhibiting type-II Weyl fermions, revealing unique surface states and offering a new platform for topological physics. This work expands the study of exotic phenomena beyond traditional quantum field theory.

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Area of Science:

  • Condensed matter physics
  • Acoustic topological phases
  • Weyl semimetals

Background:

  • Type-II Weyl fermions, distinct from type-I, are recently proposed in condensed matter systems.
  • These semimetals enable the study of exotic physical phenomena not seen in type-I systems.

Purpose of the Study:

  • To construct an acoustic analog of a type-II Weyl Hamiltonian.
  • To investigate the unique properties of this acoustic system, including its density of states and surface states.

Main Methods:

  • Stacking one-dimensional dimerized chains of acoustic resonators.
  • Developing an acoustic type-II Weyl Hamiltonian.

Main Results:

  • The acoustic system exhibits a finite density of states.
  • Unique Fermi-arc-like surface states were observed.
  • Surface state velocity is dictated by the tilting direction of type-II Weyl nodes, not Chern number chirality.

Conclusions:

  • The study successfully demonstrates an acoustic platform for type-II Weyl fermions.
  • This system offers distinct transport properties and a novel approach to constructing topological phases in various dimensions.