Drude weight anisotropy in the doped iron pnictides: the primary role of orbital weight redistribution along the reconstructed Fermi surfaces

Abstract

We explore the anisotropy in low frequency conductivity as a function of hole doping in multiorbital models of pnictides by analyzing the Drude weight in the $x$ and $y$ directions of a ($\pi$, 0) spin-density wave state. A reduction in the conductivity anisotropy with increased hole doping, and subsequent sign reversal, both observed in experiments, is found to be a common trend in these models. This behavior arises due to the interplay of low energy orbitally-resolved density of states and the geometrical features of the Fermi surface. An understanding of anisotropy in the electron doped regime, however, would require additional ingredients.

8 pages, 10 figures (To appear in PRB)

References in corpus (18)

• Spin density wave anomaly at 140 K in the ternary iron arsenide BaFe2As2
• Evidence for an electron nematic phase transition in underdoped iron pnictide superconductors
• Near-degeneracy of several pairing channels in multiorbital models for the Fe-pnictides
• Magnetism and Charge Dynamics in Iron Pnictides
• Unprecedented anisotropic metallic state in BaFe2As2 revealed by optical spectroscopy
• Phase Diagram of Ba1-xKxFe2As2
• Unconventional electronic reconstruction in undoped (Ba,Sr)Fe${}_2$As${}_2$ across the spin density wave transition
• Conductivity anisotropy in the antiferromagnetic state of iron pnictides
• ARPES studies of the electronic structure of LaOFe(P,As)
• Orbital-weight redistribution triggered by spin order in the pnictides
• Emergent defect states as a source of resistivity anisotropy in the nematic phase of iron pnictides
• Optical conductivity and Raman scattering of iron superconductors
• Anisotropic quasiparticle lifetimes in Fe-based superconductors
• Resistive anisotropy due to spin-fluctuation scattering in the nematic phase of iron pnictides
• Spin excitations in the nematic phase and the metallic stripe spin-density wave phase of iron pnictides
• Effects of Lifshitz Transition on Charge Transport in Magnetic Phases of Fe-Based Superconductors
• In-plane anisotropy of transport coefficients in the electronic nematic states: Universal origin of the nematicity in Fe-based superconductors
• Highly anisotropic quasiparticle interference patterns in the spin-density wave state of the iron pnictides

Cited by in corpus (1)

• Hund's coupling and electronic anisotropy in the spin-density wave state of iron pnictides