Physics

Signatures of chiral anomaly multiply

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Science  03 Mar 2017:
Vol. 355, Issue 6328, pp. 921-922
DOI: 10.1126/science.355.6328.921-f

Chiral anomaly is one of the most striking phenomena predicted to occur in Dirac and Weyl semimetals. One of its consequences, the decrease in electrical resistance with applied magnetic field, has been observed in several of these materials, but disentangling it from other, less exotic effects is tricky. Working with nanoplates of the Dirac semimetal Cd3As2, Zhang et al. observed two additional signatures of the chiral anomaly in nonlocal transport and optical response. The unusual nonlocal transport was caused partly by the diffusion of valley polarization, which in turn was a consequence of the chiral anomaly. These complementary signatures will make it possible to study the phenomenon more closely.

Nat. Commun. 10.1038/ncomms13741 (2017).

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