Robustness of anomaly-related magnetoresistance in doped Weyl semimetals

Abstract

Weyl semimetal with Weyl fermions at Fermi energy is one of the topological materials, and is a condensed-matter realization of the relativistic fermions. However, there are several crucial differences such as the shift of Fermi energy, which can hinder the expected interesting physics. Chiral anomaly is a representative nontrivial phenomenon associated with Weyl fermions, which dictates the transfer of fermions between the Weyl fermions with opposite chirality; it is manifested as the negative magnetoresistance. Here we demonstrate that the magnetoresistance is robust against the deviation from the ideal Weyl Hamiltonian such as the shifted Fermi energy and nonlinear dispersions. We study a model with the energy dispersion containing two Weyl nodes, and find that the magnetoresistance persists even when the Fermi level is far away from the node, even above the saddle point that separates the two nodes. Surprisingly, the magnetoresistance remains even after the pair annihilation of the nodes.

15 pages, 4 figures

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Cited by in corpus (14)

• Quantum Transport in Topological Semimetals under Magnetic Fields
• Real space Berry curvature of itinerant electron systems with spin-orbit interaction
• Thermal and gravitational chiral anomaly induced magneto-transport in Weyl semimetals
• Quantum Transport in Topological Semimetals under Magnetic Fields (II)
• Robust negative longitudinal magnetoresistance and spin-orbit torque in sputtered Pt3Sn topological semimetal
• Evidence of Ba substitution induced spin-canting in the magnetic Weyl semimetal EuCd${}_2$As${}_2$
• Phonon-limited Transport and Fermi Arc Lifetime in Weyl Semimetals
• Berry curvature derived negative magnetoconductivity observed in type-II magnetic Weyl semimetal films
• Semiclassical Boltzmann magnetotransport theory in anisotropic systems with a nonvanishing Berry curvature
• Evidence for Weyl fermions in the elemental semiconductor tellurium
• Singular nonlinear response in metals due to divergent Berry curvature: application to magneto-resistance in metals with type-II Weyl nodes
• Nonlinear orbital response across topological phase transition in centrosymmetric materials
• Spin motive force by the momentum-space Berry phase in magnetic Weyl semimetals
• Chiral anomaly induced magnetoconductances in an irradiated Type-I Weyl Semimetal