Robust temporal pumping in a magneto-mechanical topological insulator

Inbar Hotzen Grinberg, Mao Lin, Cameron Harris, Wladimir A. Benalcazar, Christopher W. Peterson, Taylor L. Hughes () and Gaurav Bahl ()
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Inbar Hotzen Grinberg: University of Illinois at Urbana-Champaign
Mao Lin: University of Illinois at Urbana-Champaign
Cameron Harris: University of Illinois at Urbana-Champaign
Wladimir A. Benalcazar: University of Illinois at Urbana-Champaign
Christopher W. Peterson: University of Illinois at Urbana-Champaign
Taylor L. Hughes: University of Illinois at Urbana-Champaign
Gaurav Bahl: University of Illinois at Urbana-Champaign

Nature Communications, 2020, vol. 11, issue 1, 1-9

Abstract: Abstract The transport of energy through 1-dimensional (1D) waveguiding channels can be affected by sub-wavelength disorder, resulting in undesirable localization and backscattering phenomena. However, quantized disorder-resilient transport is observable in the edge currents of 2-dimensional (2D) topological band insulators with broken time-reversal symmetry. Topological pumps are able to reduce this higher-dimensional topological insulator phenomena to lower dimensionality by utilizing a pumping parameter (either space or time) as an artificial dimension. Here we demonstrate a temporal topological pump that produces on-demand, robust transport of mechanical energy using a 1D magneto-mechanical metamaterial. We experimentally demonstrate that the system is uniquely resilient to defects occurring in both space and time. Our findings open a path towards exploration of higher-dimensional topological physics with time as a synthetic dimension.

Date: 2020
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DOI: 10.1038/s41467-020-14804-0

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