Raman response in the nematic phase of FeSe

Abstract

Raman experiments on bulk FeSe revealed that the low-frequency part of $B_{1g}$ Raman response $R_{B_{1g}}$, which probes nematic fluctuations, rapidly decreases below the nematic transition at $T_n\sim 85$K. Such behavior is usually associated with the gap opening and at a first glance is inconsistent with the fact that FeSe remains a metal below $T_n$, with sizable hole and electron pockets. We argue that the drop of $R_{B_{1g}}$ in a nematic metal comes about because the nematic order drastically changes the orbital content of the pockets and makes them nearly mono-orbital. In this situation $B_{1g}$ Raman response gets reduced by the same vertex corrections that enforce charge conservation. The reduction holds at low frequencies and gives rise to gap-like behavior of $R_{B_{1g}}$, in full agreement with the experimental data.

arXiv comment6 pages, 3 figures, and Supplementary Material

References in corpus (47)

• Nematic order in iron superconductors - who is in the driver's seat?
• Inelastic Light Scattering From Correlated Electrons
• Interaction corrections at intermediate temperatures: I. Longitudinal conductivity and kinetic equation
• Discovery of Orbital-Selective Cooper Pairing in FeSe
• Emergence of the nematic electronic state in FeSe
• Nematicity, magnetism and superconductivity in FeSe
• The key ingredients of the electronic structure of FeSe
• Space group symmetry, spin-orbit coupling and the low energy effective Hamiltonian for iron based superconductors
• Electronic Raman scattering in superconductors as a probe of anisotropic electron pairing
• Orbital selective pairing and gap structures of iron-based superconductors
• Low-energy microscopic models for iron-based superconductors: a review
• Magnetism, superconductivity, and spontaneous orbital order in iron-based superconductors: who comes first and why?
• Momentum-dependent sign-inversion of orbital polarization in superconducting FeSe
• Evidence for unidirectional nematic bond ordering in FeSe
• Orbital-dependent Fermi Surface shrinking as a fingerprint of nematicity in FeSe
• Charge Nematicity and Electronic Raman Scattering in Iron-based Superconductors
• Charge induced nematicity in FeSe
• Sign-reversing orbital polarization in the nematic phase of FeSe due to the $C_2$ symmetry-breaking in the self-energy
• Anisotropic spin fluctuations in detwinned FeSe
• Effect of nematic ordering on electronic structure of FeSe
• Critical Quadrupole Fluctuations and Collective Modes in Iron Pnictide Superconductors
• Nematic fluctuations and the magneto-structural phase transition in $\mathrm{Ba}(\mathrm{F}{\mathrm{e}}_{1-\mathrm{x}}\mathrm{C}{\mathrm{o}}_{\mathrm{x}}{)}_2\mathrm{A}{\mathrm{s}}_2$
• The Nematic Energy Scale and the Missing Electron Pocket in FeSe
• Electronic anisotropies revealed by detwinned ARPES measurements of FeSe
• Nematic Pairing from Orbital Selective Spin Fluctuations in FeSe
• Signature of the Leggett mode in the A1g Raman response: from MgB2 to iron-based superconductors
• Superconductivity in FeSe: the role of nematic order
• Orbital Origin of Extremely Anisotropic Superconducting Gap in Nematic Phase of FeSe Superconductor
• Orbital Nematic Instability in Two-Orbital Hubbard Model: Renormalization-Group + Constrained RPA Analysis
• Scaling of the superconducting gap with orbital character in FeSe
• Lifted electron pocket and reversed orbital occupancy imbalance in FeSe
• Anomalous temperature evolution of the electronic structure of FeSe
• Orbital-selective superconductivity in the nematic phase of FeSe
• Theory of Raman scattering from Leggett's collective mode in a multiband superconductor: Application to MgB${}_2$
• Orbital mismatch boosting nematic instability in iron-based superconductors
• Manifestation of nematic degrees of freedom in the Raman response function of iron pnictides
• Strongly enhanced temperature dependence of the chemical potential in FeSe
• Dynamical susceptibility near a long-wavelength critical point with a nonconserved order parameter
• Orbital order in FeSe - the case for vertex renormalization
• Conservation laws, vertex corrections, and screening in Raman spectroscopy
• Frustrated spin order and stripe fluctuations in FeSe
• Itinerant approach to magnetic neutron scattering of FeSe: effect of orbital selectivity
• Electronic Raman scattering from orbital nematic fluctuations
• Orbital transmutation and the electronic spectrum of FeSe in the nematic phase
• Dynamical susceptibility of a near-critical non-conserved order parameter and B2g Raman response in Fe-based superconductors
• Raman resonance in iron-based superconductors: The magnetic scenario
• Weak and strong electronic correlations in Fe superconductors

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• Lattice-Shifted Nematic Quantum Critical Point in FeSe${}_{1-x}$S${}_x$
• Contribution of Collective Excitations to Third Harmonic Generation in Multiband Superconductors: the case of MgB${}_2$
• Low frequency Raman response near Ising-nematic quantum critical point: a memory matrix approach
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• Signatures of Hund Metal and finite-frequency nesting in Sr${}_2$RuO${}_4$ Revealed by Electronic Raman Scattering
• Probing three-state Potts nematic fluctuations by ultrasound attenuation
• Specific Heat and the gap structure of a Nematic Superconductor, application to FeSe