Valley-based splitting of topologically protected helical waves in elastic plates

M. Miniaci, R. K. Pal, R. Manna, and M. Ruzzene
Phys. Rev. B 100, 024304 – Published 15 July 2019
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Abstract

Topological protection offers unprecedented opportunities for wave manipulation and energy transport in various fields of physics, including elasticity, acoustics, quantum mechanics, and electromagnetism. Distinct classes of topological waves have been investigated by establishing analogs with the quantum, spin, and valley Hall effects. We here propose and experimentally demonstrate the possibility of supporting multiple classes of topological modes within a single platform. Starting from a patterned elastic plate featuring a double Dirac cone, we create distinct topological interfaces by lifting such degeneracy through selective breaking of symmetries across the thickness and in the plane of the plate. We observe the propagation of a new class of heterogeneous helical-valley edge waves capable of isolating modes on the basis of their distinct polarization, i.e., the specific mode wave field distribution within the unit cell. Our results show the onset of wave splitting resulting from the interaction of multiple topological equal-frequency wave modes, which may have significance in applications involving elastic beam splitters, switches, and filters.

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  • Received 14 March 2019

DOI:https://doi.org/10.1103/PhysRevB.100.024304

©2019 American Physical Society

Physics Subject Headings (PhySH)

Condensed Matter, Materials & Applied Physics

Authors & Affiliations

M. Miniaci1,2,*, R. K. Pal1, R. Manna1, and M. Ruzzene1,†

  • 1School of Aerospace Engineering and School of Mechanical Engineering, Georgia Institute of Technology, North Avenue, Atlanta, Georgia 30332, USA
  • 2Empa, Laboratory of Acoustics and Noise Control, Überlandstrasse 129, 8600 Dübendorf, Switzerland

  • *marco.miniaci@gmail.com
  • ruzzene@gatech.edu

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Issue

Vol. 100, Iss. 2 — 1 July 2019

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