Fig. 1: Conceptual representation of controlling diffusion with metamaterial (MTM) platform.
From: Achieving asymmetry and trapping in diffusion with spatiotemporal metamaterials
a Comparison between the time evolution of the typical diffusion process in a conventional material and in our proposed spatiotemporal metamaterial, the latter showing an effective spatial asymmetry in diffusive flow. b Generalized schematic representation of the metamaterial platform for periodic spatiotemporal modulation of the two governing macroscopic material properties: conductivity and capacity with a relative phase difference \(\phi\) that controls the direction of the effective flow, as described in the text.
