Anomalous electronic structure and magnetoresistance in TaAs${}_2$

Abstract

The resistance of a metal in a magnetic field can be very illuminating about its ground state. Some famous examples include the integer and fractional quantum Hall effects\cite{Klitzing-QHE,Tsui-FQHE}, Shubnikov-de Haas oscillations\cite{SdH}, and weak localization\cite{Lee-WL} \emph{et al}. In non-interacting metals the resistance typically increases upon the application of a magnetic field\cite{Pippard-MR}. In contrast, in some special circumstances metals, with anisotropic Fermi surfaces\cite{Kikugawa-PdCoO2LMR} or a so-called Weyl semimetal for instance\cite{Nielsen-ABJ,Son-ChirAnom}, may have negative magnetoresistance. Here we show that semimetallic TaAs${}_2$ possesses a gigantic negative magnetoresistance ($-$98\% in a field of 3 T at low temperatures), with an unknown mechanism. Density functional calculations illustrate that TaAs${}_2$ is a new topological semimetal [${\mathbb{Z}}_2$ invariant (0;111)] without a Dirac dispersion. This demonstrates that the presence of negative magnetoresistance in non-magnetic semimetals cannot be uniquely attributed to the Adler-Bell-Jackiw anomaly of bulk Dirac/Weyl fermions. Our results also imply that the OsGe${}_2$-type monoclinic dipnictides are likely a material basis where unconventional topological semimetals may be found.

17+9 pages, 4+4 figures, 1+1 tables

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• Optical Signatures of Dirac Nodal-lines in NbAs${}_2$
• Extremely large magnetoresistance in topologically trivial semimetal $\alpha$-WP${}_2$
• Thermal chiral anomaly in the magnetic-field induced ideal Weyl phase of Bi1-xSbx topological insulators
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• Hidden Weyl Points in Centrosymmetric Paramagnetic Metals
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• Topological metals induced by Zeeman effect
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• Anisotropic Fermi surface probed by the de Haas-van Alphen oscillation in proposed Dirac Semimetal TaSb${}_2$
• Electronic properties of TaAs2 topological semimetal investigated by transport and ARPES
• Angle-dependent magnetoresistance and its implications for Lifshitz transition in W2As3
• Origin of the butterfly magnetoresistance in a Dirac nodal-line system
• Phonon-limited Transport and Fermi Arc Lifetime in Weyl Semimetals
• Topological crystalline insulator state with type-II Dirac fermions in transition metal dipnictides
• Transport signatures of surface states in a Weyl semimetal: evidence of field driven Fermi arc interferometry
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• Raman scattering study of large magnetoresistance semimetals TaAs${}_2$ and NbAs${}_2$
• Termination Dependent Topological Surface States in Nodal Loop Semimetal HfP2
• Quantum oscillations and nontrivial topological state in a compensated semimetal TaP2
• Quantum transport in a compensated semimetal W2As3 with nontrivial Z2 indices
• Reentrant Metallic Behavior in the Weyl Semimetal NbP
• Magnetoresistance and Kondo effect in the nodal-line semimetal VAs${}_2$
• The Emerging Weak Antilocalization Effect in Semimetal Ta${}_{0.7}$Nb${}_{0.3}$Sb${}_2$ Single Crystal
• Electronic structure and open-orbit Fermi surface topology in isostructural semimetals NbAs${}_2$ and W${}_2$As${}_3$ with extremely large magnetoresistance
• Generalized Design Principles for Hydrodynamic Electron Transport in Anisotropic Metals
• Robust magnetoresistance in TaAs2 under pressure up to about 37 GPa
• Shubnikov-de Haas and de Haas-van Alphen oscillations in topological semimetal CaAl4
• Large Magnetoresistance and Weak Antilocalization in V1-delta Sb2 Single Crystal
• Abnormal planar Hall effect and disentanglement of incoherent and coherent transport in a Kondo lattice
• Electronic structure in a transition metal dipnictide TaAs2
• Intertwined topological phases in TaAs2 nanowires with giant magnetoresistance and quantum coherent surface transport
• Symmetry-enforced Fermi degeneracy in topological semimetal RhSb${}_3$
• Materials and possible mechanisms of extremely large magnetoresistance: A review
• Microscopic theory of electrically induced spin torques in magnetic Weyl semimetals