Negative Magnetoresistance in Dirac Semimetal Cd3As2

Understand

A large negative magnetoresistance is anticipated in topological semimetals in the parallel magnetic and electric field configuration as a consequence of the nontrivial topological properties.

• The negative magnetoresistance is believed to demonstrate the chiral anomaly, a long-sought high-energy physics effect, in solid-state systems.
• Recent experiments reveal that Cd3As2, a Dirac topological semimetal, has the record-high mobility and exhibits positive linear magnetoresistance in the orthogonal magnetic and electric field configuration.
• However, the negative magnetoresistance in the parallel magnetic and electric field configuration remains unveiled.