Higher-order topological phases enrich topological classifications by enabling boundary states in multiple dimensions. Despite progress in phononic realizations of type-I higher-order semimetals, type-II phases remain experimentally elusive due to complicated interlayer couplings. Here, we propose a simple and universal mechanism to induce higher-order topological phase transitions from type-I to type-II semimetals via tunable interlayer coupling in a tight-binding model. Guided by this framework, we realize a type-II higher-order Weyl acoustic scatterer structure with $C_2$ symmetry that simultaneously supports two-dimensional Fermi arc surface states and one-dimensional hinge states. The acoustic architecture faithfully reproduces the tight-binding band dispersion, enabling direct experimental observation. Notably, the hinge-state selectivity is modulated not only by bulk topology but also by boundary potentials engineered through unit-cell rotation. This rotation enables selective activation of hinge states, allowing precise control over their spatial distribution. Our work provides a versatile platform for exploring higher-order topological semimetals and opens opportunities for programmable acoustic waveguides and energy manipulation.

Close

PrevNext

View figure in article

• Hinge states
• Phononic crystals
• Weyl semimetal
• Topology