Anomalous conductivity tensor in the Dirac semimetal Na_3Bi

Abstract

Na3Bi is a Dirac semimetal with protected nodes that may be sensitive to the breaking of time-reversal invariance in a magnetic field B. We report experiments which reveal that both the conductivity and resistivity tensors exhibit robust anomalies in B. The resistivity ${\rho }_{xx}$ is B-linear up to 35 T, while the Hall angle exhibits an unusual profile approaching a step-function. The conductivities ${\sigma }_{xx}$ and ${\sigma }_{xy}$ share identical power-law dependences at large B. We propose that these significant deviations from conventional transport result from an unusual sensitivity of the transport lifetime to B. Comparison with Cd3As2 is made.

8 pages, 5 figures

References in corpus (2)

• Linear magnetoresistance in metals: guiding center diffusion in a smooth random potential
• Bulk crystal growth and electronic characterization of the 3D Dirac Semimetal Na3Bi

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