Room-temperature chiral charge pumping in Dirac semimetals

Understand

Chiral anomaly, a non-conservation of chiral charge pumped by the topological nontrivial gauge fields, has been predicted to exist in Weyl semimetals.

• However, until now, the experimental signature of this effect exclusively relies on the observation of negative longitudinal magnetoresistance at low temperatures.
• Here, we report the field-modulated chiral charge pumping process and valley diffusion in Cd3As2.
• Apart from the conventional negative magnetoresistance, we observe an unusual nonlocal response with negative field dependence up to room temperature, originating from the diffusion of valley polarization.