2025/12/22 by Jia-Rui Xu, Xu, Jia-Rui, Zhan Xiong +11
Physics and Astronomy · Engineering · Materials Science · #Topological Materials and Phenomena #Acoustic Wave Phenomena Research #Metamaterials and Metasurfaces Applications
paper · doi:10.48550/arxiv.2512.19078
Antichiral surface states, characterized by unidirectional propagation on parallel surfaces, offer unique potential for controlling classical waves. However, their realization typically relies on complex implementations of the two-dimensional modified Haldane model, limiting practical applications. Here, we propose a simplified scheme to realize such states within the nodal-line semimetal phase of a single-layer honeycomb lattice, by emulating the essential physics of the modified Haldane model through an introduced layer degree of freedom. Furthermore, we demonstrate that unequal vertical interlayer couplings can generate valley higher-order topological partial bandgaps, hosting coexisting one-dimensional hinge states and gapped antichiral surface states. We numerically verify these multiple topological states in acoustic crystals, establishing a versatile platform for advanced wave manipulation.