2015/03/21 by Meng Xiao, Wen-Jie Chen, Wen‐Yu He +3 · 5 citations
Physics and Astronomy · #Advanced Condensed Matter Physics #Atomic and Subatomic Physics Research #Condensed matter physics #Faraday effect #Gauge (firearms) #Geometry #Magnetic field #Magnetic flux #Physics #Point reflection #Quantum #Quantum Hall effect #Quantum mechanics #Spontaneous symmetry breaking #Symmetry (geometry) #Symmetry breaking #Theoretical physics #Topological Materials and Phenomena #Topology (electrical circuits) #cond-mat.mes-hall #physics.class-ph
paper · pdf · doi:10.1038/nphys3458
21 pages, 9 figures
arxiv created 2015/03/21 · openalex publication_date 2015/09/07 · arxiv updated 2016/03/23 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
Inspired by the discovery of quantum hall effect and topological insulator, topological properties of classical waves start to draw worldwide attention. Topological non-trivial bands characterized by non-zero Chern numbers are realized with external magnetic field induced time reversal symmetry breaking or dynamic modulation. Due to the absence of Faraday-like effect, the breaking of time reversal symmetry in an acoustic system is commonly realized with moving background fluids, and hence drastically increases the engineering complexity. Here we show that we can realize effective inversion symmetry breaking and effective gauge field in a reduced two-dimensional system by structurally engineering interlayer couplings, achieving an acoustic analog of the topological Haldane model. We then find and demonstrate unidirectional backscattering immune edge states. We show that the synthetic gauge field is closely related to the Weyl points in the three-dimensional band structure.