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Searching for exotic transport properties in new topological state of mattersis an active topic. One of the most fascinating achievements is the chiralanomaly in recently discovered Weyl semimetals (WSMs), which is manifested as anegative longitudinal magnetoresistance (LMR) in the presence of a magneticfield B parallel to an electric field E. Another predicted key effect closelyrelated to the chiral anomaly is the planar Hall effect (PHE), which has notbeen identified in WSMs so far. Here we carried out the planar Hallmeasurements on Cd3As2 nanoplates, and found that, accompanied by the largenegative LMR, a PHE with non-zero transverse voltage can be developed whiletilting the in-plane magnetic field B away from the electric field E. Furtherexperiments reveal that both the PHE and the negative LMR can be suppressedsynchronously by increasing the temperature, but still visible at roomtemperature, indicating the same origin of these two effects. The observationof PHE in Cd3As2 nanoplates gives another transport evidence for the chiralanomaly and provides a deep insight into the chiral charge pumping in WeylFermions system.

Probing the Chiral Anomaly by Planar Hall Effect in Three-dimensional Dirac Semimetal Cd3As2 Nanoplates