Physics Colloquium

Weyl and 3D Dirac systems are characterized by the Dirac equation and are in a sense a three-dimensional generalization of graphene. These systems have recently emerged as a central focus of the condensed matter community due to the prediction of exotic transport effects emerging as a consequence of their quantum-relativistic character. Central to this is the chirality of the particles, the conservation of which gives rise to novel effects, like the emergence of unusual, topologically protected surface states that can transport chirality. We utilize high magnetic fields and advanced nano-structuring techniques to observe this process directly.