Topological semimetals (TSMs) are characterized by bulk band crossings in their electronic
structures, which are expected to give rise to gapless electronic excitations and topological …

Weyl and Dirac semimetals are three-dimensional phases of matter with gapless electronic
excitations that are protected by topology and symmetry. As three-dimensional analogs of …

Quantum materials hosting Weyl fermions have opened a new era of research in condensed
matter physics. First proposed in 1929 in the context of particle physics, Weyl fermions have …

Weyl semimetals are crystals in which electron bands cross at isolated points in momentum
space. Associated with each crossing point (or Weyl node) is a topological invariant known …

Noncentrosymmetric metals are anticipated to exhibit a dc photocurrent in the nonlinear
optical response caused by the Berry curvature dipole in momentum space. Weyl …

Semimetals are being explored for their unique advantages in low-energy high-speed
photodetection, although they suffer from serious drawbacks such as an intrinsically high …

The circular photogalvanic effect (CPGE) is the part of a photocurrent that switches
depending on the sense of circular polarization of the incident light. It has been consistently …

For many materials, a precise knowledge of their dispersion spectra is insufficient to predict
their ordered phases and physical responses. Instead, these materials are classified by the …

Weyl semimetals are topological materials whose electron quasiparticles obey the Weyl
equation. They possess many unusual properties that may lead to new applications. This is …

The theoretical proposal of chiral fermions in topological semimetals has led to a significant
effort towards their experimental realization. In particular, the Fermi surfaces of chiral …