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Article overview
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Valley based splitting of topologically protected helical waves in elastic plates | Marco Miniaci
; Raj Kumar Pal
; Raffaele Manna
; Massimo Ruzzene
; | Date: |
12 Nov 2018 | Abstract: | Topological protection offers unprecedented opportunity for wave manipulation
and energy transport in various fields of physics, including elasticity,
acoustics, quantum mechanics and electromagnetism. Several systems supporting
distinct classes of topological waves, emulating the quantum Hall, spin Hall
and valley Hall effects, have been observed, so far. Here, we propose and
experimentally demonstrate the possibility of supporting multiple classes of
topological modes in a single platform. We start from an elastic plate with
patterned holes supporting a double Dirac cone and we create distinct
topological interfaces lifting such a degeneracy by selectively breaking
symmetries along the thickness and in-plane direction of the structure. We
observe the propagation of a new class of interface modes, heterogeneous
helical-valley waves, and demonstrate how these interfaces can serve as means
to isolate two helical waves with distinct polarization. Our results open new
avenues for investigating fundamental physical phenomena arising from the
interaction of multiple topological waves, which may lead to novel applications
involving wave splitting. | Source: | arXiv, 1811.4814 | Services: | Forum | Review | PDF | Favorites |
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