Diffusion and wave propagation are both fundamental transport mechanisms, but they have
intrinsically different dynamics, governing equations, and applications. Over the past …

Diffusion driven by temperature or concentration gradients is a fundamental mechanism of
energy and mass transport that inherently differs from wave propagation in both physical …

The transportation of essential items, such as food and vaccines, often requires adaptive
multi-temperature control to maintain high safety and efficiency. While existing methods …

Convective thermal metamaterials are artificial structures where convection dominates in the
thermal process. Due to the field coupling between velocity and temperature, convection …

Willis coupling generically stems from bianisotropy or chirality in wave systems.
Nevertheless, those schemes are naturally unavailable in diffusion systems described by a …

Thermal chirality, generically referring to the handedness of heat flux, provides a significant
possibility for modern heat control. It may be realized with the thermal Hall effect yet at the …

The quantized bulk quadrupole moment has so far revealed a non-trivial boundary state with
lower-dimensional topological edge states and in-gap zero-dimensional corner modes. In …

A body that violates Kirchhoff's law of thermal radiation exhibits an inequality in its spectral
directional absorptivity and emissivity. Achieving such an inequality is of fundamental …

Many unusual wave phenomena in artificial structures are governed by their topological
properties. However, the topology of diffusion remains almost unexplored. One reason is …

Thermal nonreciprocity typically stems from nonlinearity or spatiotemporal variation of
parameters. However, constrained by the inherent temperature‐dependent properties and …