Topological and Transport Properties of Dirac Fermions in Antiferromagnetic Metallic Phase of Iron-Based Superconductors

Abstract

We investigate Dirac fermions in the antifferomagnetic metallic state of iron-based superconduc- tors. Deriving an effective Hamiltonian for Dirac fermions, we reveal that there exist two Dirac cones carrying the same chirality, contrary to graphene, compensated by a Fermi surface with a quadratic energy dispersion as a consequence of a non-trivial topological property inherent in the band structure. We also find that the presence of the Dirac fermions gives the difference of sign- change temperatures between the Hall coefficient and the thermopower. This is consistent with available experimental data.

5 pages, 4 figures, changed the title, to be published in Physical Review Letters

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• Spin and Charge Dynamics Ruled by Antiferromagnetic Order in Iron Pnictides
• Optical absorption in two-dimensional materials with tilted Dirac cones
• Two-dimensional Massless Dirac Fermions in Antiferromagnetic AFe2As2 (A = Ba, Sr)
• The three-dimensional electronic structure of the nematic and antiferromagnetic phases of NaFeAs from detwinned ARPES measurements
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• Electronic Phase Diagram of SrFe${}_2$(As${}_{1-x}$P${}_x$)${}_2$: Effect of Structural Dimensionality
• Mobility spectrum analytical approach for intrinsic band picture of Ba(FeAs)${}_2$
• Suppression of backward scattering of Dirac fermions in iron pnictides Ba(Fe${}_{1-x}$Ru${}_x$As)${}_2$
• Optical valley separation in two-dimensional semimetals with tilted Dirac cones
• Mapping borophene onto graphene: Quasi-exact solutions for guiding potentials in tilted Dirac cones
• Meissner Effect of Dirac Electrons in Superconducting State due to Inter-band Effect
• Coexistence of Antiferromagnetism and Superconductivity in Iron-Based Superconductors
• Thermoelectric signature of the nematic phase in iron-based superconductor
• Topological Aspects of Antiferromagnets
• Emergence of the minority hole with high mobility on the electrical transport in the Fe-pnictides Ba(Fe${}_{1-x}$Mn${}_x$As)${}_2$
• Linear scaling relation between two-dimensional massless Dirac fermion Fermi velocity and Fe-As bond length in iron arsenide superconductor systems
• Anomalous High-Field Magnetotransport in CaFeAsF due to the Quantum Hall Effect
• Designer gapped and tilted Dirac cones in lateral graphene superlattices