Microscopic origin of spin-orbital separation in Sr2CuO3

Abstract

Recently performed resonant inelastic x-ray scattering experiment (RIXS) at the copper L3 edge in the quasi-1D Mott insulator Sr2CuO3 has revealed a significant dispersion of a single orbital excitation (orbiton). This large and unexpected orbiton dispersion has been explained using the concept of spin-orbital fractionalization in which orbiton, which is intrinsically coupled to the spinon in this material, liberates itself from the spinon due to the strictly 1D nature of its motion. Here we investigate this mechanism in detail by: (i) deriving the microscopic spin-orbital superexchange model from the charge transfer model for the CuO3 chains in Sr2CuO3, (ii) mapping the orbiton motion in the obtained spin-orbital model into a problem of a single hole moving in an effective half-filled antiferromagnetic chain t-J model, and (iii) solving the latter model using the exact diagonalization and obtaining the orbiton spectral function. Finally, the RIXS cross section is calculated based on the obtained orbiton spectral function and compared with the RIXS experiment.

23 pages, 13 figures; v3 = style and structure improved

References in corpus (10)

• Spin-Orbital Separation in the quasi 1D Mott-insulator Sr2CuO3
• One- and Two-Triplon Spectra of a Cuprate Ladder
• Spin-Orbital Entanglement and Violation of the Goodenough-Kanamori Rules
• Fingerprints of spin-orbital entanglement in transition metal oxides
• Spectral properties of orbital polarons in Mott insulators
• Spin and orbital degrees of freedom in transition metal oxides and oxide thin films studied by soft x-ray absorption spectroscopy
• Noncollinear Magnetic Order Stabilized by Entangled Spin-Orbital Fluctuations
• Von Neumann Entropy Spectra and Entangled Excitations in Spin-Orbital Models
• Exotic spin orders driven by orbital fluctuations in the Kugel-Khomskii model
• The fate of orbitons coupled to phonons

Cited by in corpus (45)

• Direct observation of multi-spinon excitations outside of the two-spinon continuum in the antiferromagnetic spin chain cuprate Sr2CuO3
• Using RIXS to uncover elementary charge and spin excitations in correlated materials
• EDRIXS: An open source toolkit for simulating spectra of resonant inelastic x-ray scattering
• Fingerprints of an Exotic Orbital-Selective Mott Phase in the Block Magnetic State of BaFe${}_2$Se${}_3$ Ladders
• Exploring Quantum Materials with Resonant Inelastic X-Ray Scattering
• Orbital control of effective dimensionality: from spin-orbital fractionalization to confinement in the anisotropic ladder system CaCu2O3
• Variational tensor network renormalization in imaginary time: Two-dimensional quantum compass model at finite temperature
• Computing Resonant Inelastic X-Ray Scattering Spectra Using The Density Matrix Renormalization Group Method
• Quantum phase transitions in exactly solvable one-dimensional compass models
• Topological Order in an Entangled SU(2)$\otimes$XY Spin-Orbital Ring
• Quantum phase transitions in a generalized compass chain with three-site interactions
• Particle-hole asymmetry in the dynamical spin and charge structure factors of the corner-shared one-dimensional cuprates
• Fractionalization, entanglement, and separation: understanding the collective excitations in a spin-orbital chain
• Multi-spinon and holon excitations probed by resonant inelastic x-ray scattering on doped one-dimensional antiferromagnets
• How spin-orbital entanglement depends on the spin-orbit coupling in a Mott insulator
• Unraveling the orbital physics in a canonical orbital system KCuF${}_3$
• Collective nature of orbital excitations in layered cuprates in the absence of apical oxygens
• Spin-orbital order in undoped manganite LaMnO3 at finite temperature
• Mobile orbitons in Ca${}_2$CuO${}_3$: crucial role of the Hund's exchange
• Unraveling higher-order corrections in the spin dynamics of RIXS spectra
• Quantum entanglement in the one-dimensional spin-orbital SU(2)$\otimes XXZ$ model
• Spectroscopic signatures of next-nearest-neighbor hopping in the charge and spin dynamics of doped one-dimensional antiferromagnets
• Orbital Symmetry and Orbital Excitations in High-$T_c$ Superconductors
• Entanglement Driven Phase Transitions in Spin-Orbital Models
• Green's function variational approach to orbital polarons in KCuF3
• Charge transfer model for the electronic structure of layered ruthenates
• Orbiton-magnon interplay in the spin-orbital polarons of KCuF3 and LaMnO3
• Effective one-band models for the 1D cuprate Ba${}_{2-x}$Sr${}_x$CuO${}_{3+\delta }$
• Beyond-Hubbard pairing in a cuprate ladder
• Exciton and light induced ferromagnetism from doping a moiré Mott insulator
• Ultrafast control of spin-orbital separation probed with time-resolved RIXS
• Excitonic density-waves, bi-excitons and orbital selective pairing in two-orbital correlated chains
• Electronic Excitations of Hematite Heteroepitaxial Films Measured by Resonant Inelastic X-Ray Scattering at the Fe L-edge
• Magnon dressing by orbital excitations in ferromagnetic planes of K${}_2$CuF${}_4$ and LaMnO${}_3$
• Spinon-orbiton repulsion and attraction mediated by Hund's rule
• Theoretical analysis of multi-magnon excitations in resonant inelastic x-ray scattering spectra of two-dimensional antiferromagnets
• Exotic Spin Order due to Orbital Fluctuations
• Quasiparticle Description of Angle-Resolved Photoemission Spectroscopy for SrCuO2
• On the Neglect of Local Coulomb Interaction on Oxygens in Perovskites Described by the Multi-band $d-p$ Model
• One-dimensional frustrated plaquette compass model: Nematic phase and spontaneous multimerization
• Computing local multipoint correlators using the numerical renormalization group
• Quantum versus classical polarons in a ferromagnetic CuO${}_3$-like chain
• Spectroscopy of the frustrated quantum antiferromagnet Cs${}_2$CuCl${}_4$
• Orbital liquid in the $e_g$ orbital Hubbard model in $d=\infty$ dimensions
• Observation of spin-conserving two-spinon continuum in the $S$=1/2 antiferromagnetic chain system Sr${}_2$CuO${}_3$ using Cu $K$-edge resonant inelastic x-ray scattering