Majorana-like Zero Modes in Kekulé Distorted Sonic Lattices
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Other documents of the author: Gao, Penglin; Torrent, Daniel; Cervera, Francisco; San-Jose, Pablo; Sánchez-Dehesa, José; Christensen, Johan
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Title
Majorana-like Zero Modes in Kekulé Distorted Sonic LatticesAuthor (s)
Date
2019Publisher
American Physical SocietyISSN
0031-9007; 1079-7114Bibliographic citation
GAO, Penglin, et al. Majorana-like zero modes in Kekulé distorted sonic lattices. Physical review letters, 2019, vol. 123, no 19, p. 196601.Type
info:eu-repo/semantics/articlePublisher version
https://journals.aps.org/prl/abstract/10.1103/PhysRevLett.123.196601Version
info:eu-repo/semantics/publishedVersionAbstract
Topological phases have recently been realized in bosonic systems. The associated boundary modes
between regions of distinct topology have been used to demonstrate robust waveguiding, protected from
defects by the ... [+]
Topological phases have recently been realized in bosonic systems. The associated boundary modes
between regions of distinct topology have been used to demonstrate robust waveguiding, protected from
defects by the topology of the surrounding bulk. A related type of topologically protected state that is not
propagating but is bound to a defect has not been demonstrated to date in a bosonic setting. Here we
demonstrate numerically and experimentally that an acoustic mode can be topologically bound to a vortex
fabricated in a two-dimensional, Kekul´e-distorted triangular acoustic lattice. Such lattice realizes an
acoustic analog of the Jackiw-Rossi mechanism that topologically binds a bound state in a p-wave
superconductor vortex. The acoustic bound state is thus a bosonic analog of a Majorana bound state, where
the two valleys replace particle and hole components. We numerically show that it is topologically
protected against arbitrary symmetry-preserving local perturbations, and remains pinned to the Dirac
frequency of the unperturbed lattice regardless of parameter variations. We demonstrate our prediction
experimentally by 3D printing the vortex pattern in a plastic matrix and measuring the spectrum of the
acoustic response of the device. Despite viscothermal losses, the measured topological resonance remains
robust, with its frequency closely matching our simulations. [-]
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Physical review letters, 2019, vol. 123, no 19, p. 196601Investigation project
No. 714577 PHONOMETA ; RYC-2015-17156 ; TEC2014-53088-C3-1-R. ; FIS2015-65706-P. D. T ; RYC-2016-21188 ; RTI2018- 093921-A-C42Rights
© 2019 American Physical Society
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