Exploring Quantum Materials with Resonant Inelastic X-Ray Scattering

Abstract

Understanding quantum materials -- solids in which quantum-mechanical interactions among constituent electrons yield a great variety of novel emergent phenomena -- is a forefront challenge in modern condensed matter physics. This goal has driven the invention and refinement of several experimental methods, which can spectroscopically determine the elementary excitations and correlation functions that determine material properties. This Perspectives article focuses on the future experimental and theoretical trends of resonant inelastic x-ray scattering (RIXS), which is a remarkably versatile and rapidly growing technique for probing different charge, lattice, spin, and orbital excitations in quantum materials. We provide a forward-looking introduction to RIXS and outline how this technique is poised to deepen our insight into the nature of quantum materials and their emergent electronic phenomena.

Review of RIXS to appear in Physical Review X as a Perspective

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• Witnessing quantum criticality and entanglement in the triangular antiferromagnet KYbSe${}_2$
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• Quantifying and controlling entanglement in the quantum magnet Cs${}_2$CoCl${}_4$
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• Probing light-driven quantum materials with ultrafast resonant inelastic X-ray scattering
• Measurement of the dynamic charge response of materials using low-energy, momentum-resolved electron energy-loss spectroscopy (M-EELS)
• Strong Superexchange in a $d^{9-\delta }$ Nickelate Revealed by Resonant Inelastic X-Ray Scattering
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• Absence of $3a_0$ Charge Density Wave Order in the Infinite Layer Nickelates
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• Ultrafast dynamics of spin and orbital correlations in quantum materials: an energy- and momentum-resolved perspective
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• Exploring nonequilibrium phases of photo-doped Mott insulators with Generalized Gibbs ensembles
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• Orbital engineering in nickelate heterostructures driven by anisotropic oxygen hybridization rather than orbital energy levels
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• Computing Resonant Inelastic X-Ray Scattering Spectra Using The Density Matrix Renormalization Group Method
• Quadrupolar magnetic excitations in an isotropic spin-1 antiferromagnet
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• Time-Resolved Resonant Inelastic X-Ray Scattering in a Pumped Mott Insulator
• Engineering One-Dimensional Quantum Stripes from Superlattices of Two-Dimensional Layered Materials
• Spin liquid and quantum phase transition without symmetry breaking in a frustrated three-dimensional Ising model
• Bimagnon studies in cuprates with Resonant Inelastic X-ray Scattering at the O K edge. II - The doping effect in La2-xSrxCuO4
• Probing spinon nodal structures in three-dimensional Kitaev spin liquids
• Orbital dynamics during an ultrafast insulator to metal transition
• The antiferromagnetic phase of the Floquet-driven Hubbard model
• Evolution of plasmon excitations across the phase diagram of the cuprate superconductor La${}_{2-x}$Sr${}_x$CuO${}_4$
• Generalization of the Franck-Condon model for phonon excitations by resonant inelastic X-ray scattering
• Observing spin fractionalization in the Kitaev spin liquid via temperature evolution of indirect resonant inelastic x-ray scattering
• X-ray spectroscopy of rare-earth nickelate LuNiO${}_3$: LDA+DMFT study
• Role of Oxygen States in the Low Valence Nickelate La${}_4$Ni${}_3$O${}_8$
• Theoretical study of the spin and charge dynamics of two-leg ladders as probed by resonant inelastic x-ray scattering
• Spin, charge and $\eta$-spin separation in one-dimensional photo-doped Mott insulators
• Fractional spin excitations in the infinite-layer cuprate CaCuO${}_2$
• Dynamics of a j=3/2 quantum spin liquid
• Simulation of time-dependent resonant inelastic X-ray scattering using non-equilibrium dynamical mean-field theory
• Dynamics of a two-dimensional quantum spin-orbital liquid: spectroscopic signatures of fermionic magnons
• Nearly itinerant electronic groundstate in the intercalated honeycomb iridate Ag${}_3$LiIr${}_2$O${}_6$
• Lattice coupling and Franck-Condon effects in K-edge resonant inelastic X-ray scattering
• Evidence for photoinduced sliding of the charge-order condensate in La${}_{1.875}$Ba${}_{0.125}$CuO${}_4$
• Prevailing charge order in overdoped cuprates beyond the superconducting dome
• Multipartite entanglement in the 1-D spin-$\frac{1}{2}$ Heisenberg Antiferromagnet
• Emergence of spinons in layered trimer iridate Ba4Ir3O10
• Description of resonant inelastic x-ray scattering in correlated metals
• Probing electron-phonon interactions away from the Fermi level with resonant inelastic x-ray scattering
• Distinct spin and orbital dynamics in Sr${}_2$RuO${}_4$
• Probing the interplay between lattice dynamics and short-range magnetic correlations in CuGeO3 with femtosecond RIXS
• Unraveling the orbital physics in a canonical orbital system KCuF${}_3$
• Unraveling higher-order corrections in the spin dynamics of RIXS spectra
• Dimensionality dependent electronic structure of the exfoliated van der Waals antiferromagnet NiPS${}_3$
• Non-perturbative series expansion of Green's functions: The Anatomy of Resonant Inelastic X-Ray Scattering in Doped Hubbard Model
• Novel magnetic excitations beyond the single- and double-magnons
• Single- and Multimagnon Dynamics in Antiferromagnetic $\alpha$-Fe${}_2$O${}_3$ Thin Films
• Electronic character of charge order in square planar low valence nickelates
• Beyond the single-site approximation modeling of electron-phonon coupling effects on resonant inelastic X-ray scattering spectra
• Nonequilibrium RIXS study of an electron-phonon model
• Low-energy plasmon excitations in infinite-layer nickelates
• Diffraction gratings with two-orders-of-magnitude-enhanced dispersion rates for sub-meV-resolution soft x-ray spectroscopy
• Interplay of broken symmetry and delocalized excitations in the insulating state of 1$T$-TaS${}_2$
• Dimensional crossover on multileg attractive-$U$ Hubbard ladders
• Resonant Inelastic X-Ray Scattering in Metals: A Diagrammatic Approach
• Ultrafast X-ray Absorption Spectroscopy of Strongly Correlated Systems: Core Hole Effect
• Numerical study of resonant inelastic X-ray scattering at the oxygen $K$-edge in insulating cuprates

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• Magnetic excitations in Nd${}_{n+1}$Ni${}_n$O${}_{3n+1}$ Ruddlesden-Popper nickelates observed via resonant inelastic x-ray scattering
• Antiferromagnetic and bond-order-wave phases in the half-filled two-dimensional optical Su-Schrieffer-Heeger-Hubbard model
• Resonant inelastic X-ray scattering investigation of Hund's and spin-orbit coupling in $5d^2$ double perovskites
• High-throughput search for topological magnon materials
• Observation of anisotropic dispersive dark exciton dynamics in CrSBr
• A versatile setup for symmetry-resolved ultrafast dynamics of quantum materials
• Coupled-cluster approach to vibronic effects in resonant inelastic x-ray scattering of quantum materials: Application to a $5d^1$ rhenium oxide
• A light-induced charge order mode in a metastable cuprate ladder
• Anisotropic electron damping and energy gap in Bi${}_2$Sr${}_2$CaCu${}_2$O${}_{8+\delta }$
• Magnon damping and mode softening in quantum double-exchange ferromagnets
• Accelerating Resonant Spectroscopy Simulations Using Multi-Shifted Bi-Conjugate Gradient
• Hamiltonian parameter inference from resonant inelastic x-ray scattering with active learning
• Witnessing Spin-Orbital Entanglement using Resonant Inelastic X-Ray Scattering
• Observation of correlated plasmons in low-valence nickelates
• Strongly correlated model of acousticlike plasmons persisting across the phase diagram of cuprate superconductors
• Excitations across the equilibrium and photoinduced `hidden' states of magnetoresistive manganites
• Resonant inelastic X-ray scattering in the topological semimetal FeSi