# Spin–orbital separation in the quasi-one-dimensional Mott insulator Sr2CuO3

@article{Schlappa2012SpinorbitalSI, title={Spin–orbital separation in the quasi-one-dimensional Mott insulator Sr2CuO3}, author={J. Schlappa and Krzysztof Wohlfeld and Kejin Zhou and Martin Mourigal and Maurits W. Haverkort and Vladimir N. Strocov and Liviu Hozoi and Claude Monney and Satoshi Nishimoto and S. K. Singh and Alexandre Revcolevschi and Jean-S{\'e}bastien Caux and Luc Patthey and Henrik M. R{\o}nnow and Jeroen van den Brink and Thorsten Schmitt}, journal={Nature}, year={2012}, volume={485}, pages={82-85} }

When viewed as an elementary particle, the electron has spin and charge. When binding to the atomic nucleus, it also acquires an angular momentum quantum number corresponding to the quantized atomic orbital it occupies. Even if electrons in solids form bands and delocalize from the nuclei, in Mott insulators they retain their three fundamental quantum numbers: spin, charge and orbital. The hallmark of one-dimensional physics is a breaking up of the elementary electron into its separate degrees…

## 217 Citations

### Orbital-exchange and fractional quantum number excitations in an f-electron metal, Yb2Pt2Pb

- PhysicsScience
- 2016

Neutron-scattering experiments on the 4f-electron metal Yb2Pt2Pb overturn this conventional wisdom and observe broad magnetic continuum dispersing in only one direction, which indicates that the underlying elementary excitations are spinons carrying fractional spin-1/2.

### Solid-state physics: Electrons do the split

- PhysicsNature
- 2012

It is confirmed that all of the fundamental degrees of freedom of the electron can 'fractionalize', putting spin and orbital excitations on an equal footing.

### 28pAK-16 Spin-Orbital Quantum Liquid on the Honeycomb Lattice

- Physics
- 2012

The main characteristic of Mott insulators, as compared to band insulators, is to host low-energy spin fluctuations. In addition, Mott insulators often possess orbital degrees of freedom when…

### Excitonic quasiparticles in a spin-orbit Mott insulator.

- PhysicsNature communications
- 2014

The observation of a composite particle in a quasi-two-dimensional spin-1/2 antiferromagnet Sr2IrO4--an exciton dressed with magnons--that propagates with the canonical characteristics of a QP: a finite QP residue and a lifetime longer than the hopping time scale is reported.

### Probing multi-spinon excitations outside of the two-spinon continuum in the antiferromagnetic spin chain cuprate Sr2CuO3

- PhysicsNature Communications
- 2018

It is shown that four- spinon excitations can be accessed directly in Sr2CuO3 using resonant inelastic x-ray scattering (RIXS) in a region of phase space clearly separated from the two-spinon continuum, which provides a new route for the creation of magnetic excitations in 1D materials.

### Strong Correlations in Density-Functional Theory: A Model of Spin-Charge and Spin-Orbital Separations.

- PhysicsJournal of chemical theory and computation
- 2014

By means of 1D discrete Hubbard chains and 1D H2 molecules in the continuum, it is found that spin-charge separation yields almost constant HO KS eigenvalues, whereas the spin-orbital counterpart can be decisive when describing derivative discontinuities of XC potentials at strong correlations.

### Nanoscale orbital excitations and the infrared spectrum of a molecular Mott insulator: A15-Cs3C60.

- PhysicsNanoscale
- 2016

It is shown that the unbroken spin and orbital symmetry of the ion multiplets explains the IR spectrum without adjustable parameters, demonstrating the importance of a fully quantum treatment of nuclear positions and orbital momenta in the Mott insulator sites, dynamically but not statically distorted.

### Particle-hole asymmetry in the dynamical spin and charge responses of corner-shared 1D cuprates

- PhysicsCommunications Physics
- 2021

Although many experiments imply that oxygen orbitals play an essential role in the high-temperature superconducting cuprates, their precise role in collective spin and charge excitations and…

### How spin-orbital entanglement depends on the spin-orbit coupling in a Mott insulator

- PhysicsPhysical Review Research
- 2020

The concept of the entanglement between spin and orbital degrees of freedom plays a crucial role in our understanding of various phases and exotic ground states in a broad class of materials,…

## References

SHOWING 1-10 OF 35 REFERENCES

### Fingerprints of spin-orbital physics in cubic Mott insulators: Magnetic exchange interactions and optical spectral weights

- Physics
- 2005

The temperature dependence and anisotropy of optical spectral weights associated with different multiplet transitions is determined by the spin and orbital correlations. To provide a systematic basis…

### Distinct spinon and holon dispersions in photoemission spectral functions from one-dimensional SrCuO2

- Physics
- 2006

Spin and charge are inseparable traits of an electron, but in one-dimensional solids, theory predicts their separation into collective modes—as independent excitation quanta (or particles) called…

### Intrinsic coupling of orbital excitations to spin fluctuations in Mott insulators.

- PhysicsPhysical review letters
- 2011

The composite orbiton-magnon modes that emerge fractionalize again in one dimension, giving rise to spin-orbital separation in the peculiar regime where spinons are faster than orbitons.

### Two-spinon and orbital excitations of the spin-Peierls system TiOCl.

- PhysicsPhysical review letters
- 2011

We combine high-resolution resonant inelastic x-ray scattering with cluster calculations utilizing a recently derived effective magnetic scattering operator to analyze the polarization, excitation…

### Four-band extended Hubbard Hamiltonian for the one-dimensional cuprate Sr 2 CuO 3 : Distribution of oxygen holes and its relation to strong intersite Coulomb interaction

- Physics
- 2000

We have carried out experimental and theoretical studies of the unoccupied electronic structure of Sr 2CuO3, which can be regarded as the best realization of a one-dimensional model system containing…

### Magnetic excitations and phase separation in the underdoped La2-xSrxCuO4 superconductor measured by resonant inelastic X-ray scattering.

- PhysicsPhysical review letters
- 2010

It is shown that the single magnon dispersion measured with RIXS coincides with the one determined by inelastic neutron scattering, thus demonstrating that x rays are an alternative to neutrons in this field.

### The Resonating Valence Bond State in La2CuO4 and Superconductivity

- PhysicsScience
- 1987

The oxide superconductors, particularly those recently discovered that are based on La2CuO4, have a set of peculiarities that suggest a common, unique mechanism: they tend in every case to occur near…

### The Resonating Valence Bond State in La 2 CuO 4 and Superconductivity

- Physics
- 1987

The oxide superconductors, particularly those recently discovered that are based on La2CuO4have a set of peculiarities that suggest a common, unique mechanism: they tend in every case to occur near a…

### Energy and symmetry of dd excitations in undoped layered cuprates measured by Cu L3 resonant inelastic x-ray scattering

- Physics
- 2011

We measured the high-resolution Cu L3 edge resonant inelastic x-ray scattering (RIXS) of undoped cuprates La2CuO4, Sr2CuO2Cl2, CaCuO2 and NdBa2Cu3O6. The dominant spectral features were assigned to…

### Single hole dynamics in the one-dimensional - model

- Physics
- 1999

Abstract:We present a new finite-temperature quantum Monte Carlo algorithm to compute imaginary-time Green functions for a single hole in the t-J model on non-frustrated lattices. Spectral functions…