Electronic Raman scattering from orbital nematic fluctuations

Abstract

We compute Raman scattering intensities via the lowest-order coupling to the bosonic propagator associated with orbital nematic fluctuations in a minimal model for iron pnictides. The model consists of two bands on a square lattice exhibiting four Fermi pockets and a transition from the normal to a nematic state. It is shown that the orbital fluctuations produce in the B1g channel strong quasi-elastic light scattering around the nematic critical temperature Tn, both above and below Tn. This holds for the A1g symmetry only below Tn whereas no low-energy scattering from orbital fluctuations is found in the B2g symmetry. Due to the nematic distortion the electron pocket at the X-point may disappear at low temperatures. Such a Lifshitz transition causes in the B2g spectrum a large upward shift of spectral weight in the high energy region whereas no effect is seen in the other symmetries.

23 pages, 7 figures

References in corpus (15)

• Theory of Electron Nematic Order in LaOFeAs
• Inelastic Light Scattering From Correlated Electrons
• Lattice symmetry breaking in cuprate superconductors: Stripes, nematics, and superconductivity
• A minimal two-band model for the superconducting Fe-pnictides
• Nematic and meta-nematic transitions in the iron pnictides
• Spin-orbital frustrations and anomalous metallic state in iron-pnictide superconductors
• Instability toward Formation of Quasi-One-Dimensional Fermi Surface in Two-Dimensional t-J Model
• Possible Quasi-One-Dimensional Fermi Surface in La_{2-x}Sr_{x}CuO_4
• Manifestations of nematic degrees of freedom in the magnetic, elastic, and superconducting properties of the iron pnictides
• Spin Fluctuations, Interband Coupling, and Unconventional Pairing in Iron-based Superconductors
• Unconventional metamagnetic electron states in orbital band systems
• Pinpointing Gap Minima in Ba(Fe${}_{0.94}$Co${}_{0.06}{)}_2$As${}_2$ \textit{via} Band Structure Calculations and Electronic Raman Scattering
• Experimental observables near a nematic quantum critical point in the pnictide and cuprate superconductors
• Theory of Raman response in a superconductor with extended s-wave symmetry: Application to Fe-pnictides
• Optical conductivity and Raman scattering of iron superconductors

Cited by in corpus (20)

• Charge Nematicity and Electronic Raman Scattering in Iron-based Superconductors
• Charge induced nematicity in FeSe
• Critical Quadrupole Fluctuations and Collective Modes in Iron Pnictide Superconductors
• Superconductivity from orbital nematic fluctuations
• Raman scattering as a probe of nematic correlations
• High Tc superconductivity in CaKFe${}_4$As${}_4$ in absence of nematic fluctuations
• Raman response in the nematic phase of FeSe
• Elastoresistance measurements on CaKFe${}_4$As${}_4$ and KCa${}_2$Fe${}_4$As${}_4$F${}_2$ with the Fe site of $C_{2v}$ symmetry
• Fractional Spin fluctuations and quantum liquid signature in Gd2ZnIrO6
• Nematic Fluctuations and Phase Transitions in LaFeAsO: a Raman Scattering Study
• Raman resonance in iron-based superconductors: The magnetic scenario
• Fluctuations and pairing in Fe-based superconductors: Light scattering experiments
• Theoretical insights into electronic nematic order, bond-charge orders, and plasmons in cuprate superconductors
• Quadrupolar charge dynamics in the nonmagnetic FeSe${}_{1-x}$S${}_x$ superconductors
• Fluctuating Fractionalized Spins in Quasi Two-dimensional Magnetic V0.85PS3
• Superconductivity and fluctuation in Ba${}_{1-p}$K${}_p$Fe${}_2$As${}_2$ and Ba(Fe${}_{1-n}$Co${}_n$)${}_2$As${}_2$
• Raman scattering as a probe of charge nematic fluctuations in iron based superconductors
• Superconducting gap and nematic resonance at the quantum critical point observed by Raman scattering in $\mathrm{BaF}{\mathrm{e}}_2({\mathrm{As}}_{1-x}{\mathrm{P}}_x{)}_2$
• Orbital order from the on-site orbital attraction
• Detecting isotropic density and nematic fluctuations using ultrafast coherent phonon spectroscopy