RT Journal Article
T1 Majorana-like Zero Modes in Kekulé Distorted Sonic Lattices
A1 Gao, Penglin
A1 Torrent, Daniel
A1 Cervera, Francisco
A1 San-José, Pablo
A1 Sánchez Dehesa, José
A1 Christensen, Johan
AB 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, Kekulé-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.
PB American Physical Society
SN 0031-9007
YR 2019
FD 2019-11-08
LK https://hdl.handle.net/10016/31582
UL https://hdl.handle.net/10016/31582
LA eng
NO J. C. acknowledges support from the European Research Council (ERC) through the Starting Grant No. 714577 PHONOMETA and from the MINECO through a Ramón yCajal grant (No. RYC-2015-17156). J. S.-D. acknowledges support from the Ministerio de Economía y Competitividad of the Spanish Government and the European Union “Fondo Europeo de Desarrollo Regional (FEDER)” through Project No. TEC2014-53088-C3-1-R. P. S.-J. acknowledges support from MINECO/FEDER underGrant No. FIS2015-65706-P. D. T. acknowledges financialsupport through the Ramón y Cajal fellowship under GrantNo. RYC-2016-21188 and to the Ministry of Science,Innovation and Universities through Project No. RTI2018-093921-A-C42.
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