In active matter systems, individual constituents convert energy into non-conservative forces
or motion at the microscale, leading to morphological features and transport properties that …

The topological properties of an object, associated with an integer called the topological
invariant, are global features that cannot change continuously but only through abrupt …

Artificial gauge fields are currently realized in a wide range of physical settings. This
includes solid-state devices but also engineered systems, such as photonic crystals …

Owing to the chirality of Weyl nodes, the Weyl systems can support one-way chiral zero
modes under a strong magnetic field, which leads to nonconservation of chiral currents—the …

Waves are generally characterized by angular frequency ω and wavevector k. Accordingly,
this tutorial is structured into two parts, one on resonance-based acoustic metamaterials, in …

Electromagnetic metastructures stand for the artificial structures with a characteristic size
smaller than the wavelength, which may efficiently manipulate the states of light. However …

We report on the design and experimental validation of a two-dimensional phononic elastic
waveguide exhibiting topological valley-Hall edge states. The lattice structure of the …

Condensed-matter and other engineered systems, such as cold atoms, photonic or
phononic metamaterials, have proved to be versatile platforms for the observation of low …

Dirac and Weyl semimetals react to position-dependent and time-dependent perturbations,
such as strain, as if subject to emergent electromagnetic fields, known as pseudo-fields …

The field of spinoptronics is underpinned by good control over photonic spin-orbit coupling
in devices that have strong optical nonlinearities. Such devices might hold the key to a new …