Article Dans Une Revue Physical Review B Année : 2022

Topological waves guided by a glide-reflection symmetric crystal interface

Résumé

A domain wall separating two different topological phases of the same crystal can support the propagation of backscattering-immune guided waves. In valley-Hall and quantum-Hall crystal waveguides, this property stems from symmetry protection and results from a topological transition at a Dirac point. Since an initially closed band gap has to open, the guidance bandwidth remains limited compared to that of wide band gap crystals. When a glide-symmetric dislocation is introduced in a 2D crystal, we show that a pair of wide-bandwidth, single-mode, and symmetry-protected guided waves appear in the bulk band gap. The 2D Zak phase changes by π on either side of the interface, providing a topological invariant protected by glide-reflection symmetry at the X point of the Brillouin zone. A demonstration experiment is performed with acoustic waves in water, at ultrasonic frequencies, and shows the continuous tuning of transmission as a function of the glide parameter. The concept further extends to other types of waves, including the case of elastic waves in solids, but also of optical and electromagnetic waves

Dates et versions

hal-03813053 , version 1 (21-10-2022)

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Citer

Julio Andrés Iglesias Martinez, Nicolas Laforge, Muamer Kadic, Vincent Laude. Topological waves guided by a glide-reflection symmetric crystal interface. Physical Review B, 2022, 106, pp.064304 (6). ⟨10.1103/PhysRevB.106.064304⟩. ⟨hal-03813053⟩
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