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Weyl fermions possess the property of spin-momentum locking: the expectationvalue of the spin is parallel or antiparallel to the momentum at any givenpoint in the Brillouin zone in the vicinity of a Weyl node. This is a directconsequence of the fact that Weyl nodes are monopoles of the Berry curvature,and in this sense an expression of the nontrivial Weyl electronic structuretopology. Thanks to this property, an isolated Weyl node produces a large spinaccumulation in response to a charge current, $\hbar/2$ per electron, similarto surface states of time-reversal invariant topological insulators. However,in bulk Weyl semimetals, the nodes must occur in pairs of opposite chiralityand, when the nodes are at the same energy, the effect cancels out. Here weshow that this cancellation is avoided in chiral semimetals, in which Weylnodes of opposite chirality occur at different energies due to broken mirrorsymmetry. We find that the spin accumulation is maximized when the Fermi energycoincides with one of the nodes in a pair and reaches the same value as for anisolated node in this case. Moreover, we demonstrate the existence of adistinct magnetoresistance mechanism, closely related to this current-inducedspin accumulation.

Current-Induced Spin Accumulation and Magnetoresistance in Chiral Semimetals