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Dirac and Weyl materials possess chiral fermions, which are characterized bynontrivial topology and large Berry curvature. Chiral fermions have nontrivialinteractions with magnetic fields and light. In this work, we propose threedifferent mechanisms for magnetic photocurrents caused by chiral fermions, withdifferent requirements on the symmetry group of the crystal. We also studyquantum oscillations of the anomalous current in the presence of a magneticfield, showing it has a different phase from the Ohmic current. We formulate amechanism for THz emission observed in TaAs in response to ultrafast pulses. Wepropose a strain-induced anomalous current. We also show that an externalmagnetic field can create a difference between left and right handed fermions,which can be controlled by changing the field.

Magnetic and Optical Response of Chiral Fermions