  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 the first 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 new path towards exploration of higher-dimensional topological physics
with time as a synthetic dimension.
