Giant anisotropic magnetoresistance and planar Hall effect in the Dirac semimetal Cd3As2

Abstract

Anisotropic magnetoresistance is the change tendency of resistance of a material on the mutual orientation of the electric current and the external magnetic field. Here, we report experimental observations in the Dirac semimetal Cd3As2 of giant anisotropic magnetoresistance and its transverse version, called the planar Hall effect. The relative anisotropic magnetoresistance is negative and up to -68% at 2 K and 10 T. The high anisotropy and the minus sign in this isotropic and nonmagnetic material are attributed to a field-dependent current along the magnetic field, which may be induced by the Berry curvature of the band structure. This observation not only reveals unusual physical phenomena in Weyl and Dirac semimetals, but also finds additional transport signatures of Weyl and Dirac fermions other than negative magnetoresistance.

References in corpus (6)

• The Chiral Magnetic Effect
• Chiral anomaly and transport in Weyl metals
• Linear magnetoresistance caused by mobility fluctuations in the n-doped Cd3As2
• Chiral Anomaly and Diffusive Magnetotransport in Weyl Metals
• Quantum Transport in Topological Semimetals under Magnetic Fields
• Negative magnetoresistance due to conductivity fluctuations in films of the topological semimetal Cd3As2

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