  Dirac and Weyl materials refer to a class of solid materials which host
low-energy quasiparticle excitations that can be described by the Dirac and
Weyl equations in relativistic quantum mechanics. Starting with the advent of
graphene as the first prominent example, these materials have been attracting
tremendous interest owing to their novel fundamental properties as well as the
great potential for applications. Here we introduce the basic concepts and
notions related to Dirac and Weyl materials and briefly review some recent
works in this field, particularly on the conceptual development and the
possible spintronics/pseudospintronics applications.
