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

Schlappa, Justine; Wohlfeld, Krzysztof; Zhou, Kejin; Mourigal, Martin; Haverkort, M. W.; Strocov, Vladimir N.; Hozoi, Liviu; Monney, Claude; Nishimoto, Sei‐ichi; Singh, Surjeet; Revcolevschi, A.; Caux, Jean-Sébastien; Patthey, L.; Rønnow, Henrik M.; Brink, Jeroen van den; Schmitt, Thorsten

doi:10.1038/nature10974

Cited by 328 publications

(392 citation statements)

References 29 publications

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“…Our results for solid argon are a prediction for future experiments. This work opens the way for a large variety of applications, from the investigation of vertex corrections beyond the GW approximation for spectral properties to the study of dispersion of orbiton excitations in transition-metal oxides, 52 and represents a fundamental step towards an ab initio analysis of exciton propagation in real materials. 13 …”

Section: Discussionmentioning

confidence: 99%

Exciton dispersion from first principles

Gatti

Sottile

2013

Phys. Rev. B

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We present a scheme to calculate exciton dispersions in real materials that is based on the first-principles many-body Bethe-Salpeter equation. We assess its high level of accuracy by comparing our results for LiF with recent inelastic x-ray scattering experimental data on a wide range of energy and momentum transfer. We show its great analysis power by investigating the role of the different electron-hole interactions that determine the exciton band structure and the peculiar "exciton revival" at large momentum transfer. Our calculations for solid argon are a prediction and a suggestion for future experiments. These results demonstrate that the first-principles Bethe-Salpeter equation is able to describe the dispersion of localized and delocalized excitons on equal footing and represent a key step for the ab initio study of the exciton mobility.

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Section: Discussionmentioning

confidence: 99%

Exciton dispersion from first principles

Gatti

Sottile

2013

Phys. Rev. B

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“…Both of these effects have been shown to strongly damp or wash out sharp QPs [34][35][36] , thereby significantly redistributing the hole spectral function. In fact, most likely for these reasons, for a quasi-one-dimensional system Sr 2 CuO 3 in which the phenomenon of spin-charge/orbital separation is established 37,38 , ARPES measures much-broadened spectra 39,40 of the theoretically predicted sharp edge-singularity in the exactly solvable model. By contrast, a charge-neutral exciton with a quadrupole moment should couple much more weakly to the lattice and is not subject to long-range Coulomb forces due to impurities.…”

Section: Article Nature Communications | Doi: 101038/ncomms5453mentioning

confidence: 99%

Excitonic quasiparticles in a spin–orbit Mott insulator

et al. 2014

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In condensed matter systems, out of a large number of interacting degrees of freedom emerge weakly coupled quasiparticles (QPs), in terms of which most physical properties are described. The lack of identification of such QPs is a major barrier for understanding myriad exotic properties of correlated electrons, such as unconventional superconductivity and non-Fermi liquid behaviours. Here we report the observation of a composite particle in a quasi-two-dimensional spin-1/2 antiferromagnet Sr 2 IrO 4 -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. The dynamics of this charge-neutral excitation mirrors the fundamental process of the analogous one-hole propagation in the background of spins-1/2, and reveals the same intrinsic dynamics that is obscured for a single, charged-hole doped into two-dimensional cuprates.

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“…1a). This is highlighted by the pivotal role that RIXS has recently played in revealing orbital and magnetic excitations in cuprates [16][17][18][19][20] . In addition, RIXS provided the first X-ray scattering evidence for an incommensurate CDW in (Y,Nd)Ba 2 Cu 3 O 6+δ (ref.…”

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confidence: 99%

Dispersive charge density wave excitations in Bi2Sr2CaCu2O8+δ

et al. 2017

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Experimental evidence on high-T c cuprates reveals ubiquitous charge density wave (CDW) modulations 1-10 , which coexist with superconductivity. Although the CDW had been predicted by theory 11-13 , important questions remain about the extent to which the CDW influences lattice and charge degrees of freedom and its characteristics as functions of doping and temperature. These questions are intimately connected to the origin of the CDW and its relation to the mysterious cuprate pseudogap 10,14 . Here, we use ultrahigh-resolution resonant inelastic X-ray scattering to reveal new CDW character in underdoped Bi 2.2 Sr 1.8 Ca 0.8 Dy 0.2 Cu 2 O 8+δ . At low temperature, we observe dispersive excitations from an incommensurate CDW that induces anomalously enhanced phonon intensity, unseen using other techniques. Near the pseudogap temperature T * , the CDW persists, but the associated excitations significantly weaken with an indication of CDW wavevector shift. The dispersive CDW excitations, phonon anomaly, and analysis of the CDW wavevector provide a comprehensive momentumspace picture of complex CDW behaviour and point to a closer relationship with the pseudogap state.With sufficient energy resolution, resonant inelastic X-ray scattering (RIXS) can be an ideal probe for revealing the CDW excitations in cuprates. By tuning the incident photon energy to the Cu L 3 -edge (Fig. 1a), the resonant absorption and emission processes can leave the system in excited final states, which couple to a variety of excitations arising from orbital, spin, charge, and lattice degrees of freedom 15 . Thus, information of these elementary excitations in energy and momentum space can be deduced from analysing the RIXS spectra as functions of the energy loss and the momentum transfer of the photons (Fig. 1a). This is highlighted by the pivotal role that RIXS has recently played in revealing orbital and magnetic excitations in cuprates [16][17][18][19][20] . In addition, RIXS provided the first X-ray scattering evidence for an incommensurate CDW in (Y,Nd)Ba 2 Cu 3 O 6+δ (ref. 4), owing to energy resolution that separated the quasi-elastic CDW signal (bright spot in Fig. 1b, limited by the instrumental resolution ∼130 meV) from other intense higher-energy excitations. Notably this quasi-elastic signal is asymmetric with respect to zero energy loss (Fig. 1c), which indicates the possible existence of additional low-energy excitations near the CDW wavevector (Q CDW ).In this work, we exploit the newly commissioned ultrahighresolution RIXS instrument at the European Synchrotron Radiation Facility to reveal these low-energy excitations near the CDW. We choose the double-layer cuprate Bi 2.2 Sr 1.8 Ca 0.8 Dy 0.2 Cu 2 O 8+δ (Bi2212), whose electronic structure has been extensively studied by surface-sensitive spectroscopy, such as scanning tunnelling microscopy 21 and angle-resolved photoemission 22 , and in which a short-range CDW order was recently reported 7,8 . With improved energy resolution up to 40 meV, we see additional features in the pre...

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

Cited by 328 publications

References 29 publications

Exciton dispersion from first principles

Exciton dispersion from first principles

Excitonic quasiparticles in a spin–orbit Mott insulator

Dispersive charge density wave excitations in Bi2Sr2CaCu2O8+δ

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