Dynamical spin susceptibility in 
<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:msub><mml:mi>La</mml:mi><mml:mn>2</mml:mn></mml:msub><mml:msub><mml:mi>CuO</mml:mi><mml:mn>4</mml:mn></mml:msub></mml:mrow></mml:math>
 studied by resonant inelastic x-ray scattering

Robarts, H. C.; García-Fernández, Mirian; Li, J.; Nag, Abhishek; Walters, A. C.; Headings, N. S.; Hayden, Stephen M; Zhou, Kejin

doi:10.1103/physrevb.103.224427

Cited by 11 publications

(3 citation statements)

References 53 publications

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“…( 9 ), may flip a spin due to the spin-orbit coupling of the core levels. This spin-flip process is maximized for the π − σ polarization and, therefore, provides a good estimate of the dynamical structure factor 75 , 77 , 103 – 105 . Throughout this paper, we exclusively employ such a polarization configuration.…”

Section: Methodsmentioning

confidence: 99%

Witnessing light-driven entanglement using time-resolved resonant inelastic X-ray scattering

et al. 2023

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Characterizing and controlling entanglement in quantum materials is crucial for the development of next-generation quantum technologies. However, defining a quantifiable figure of merit for entanglement in macroscopic solids is theoretically and experimentally challenging. At equilibrium the presence of entanglement can be diagnosed by extracting entanglement witnesses from spectroscopic observables and a nonequilibrium extension of this method could lead to the discovery of novel dynamical phenomena. Here, we propose a systematic approach to quantify the time-dependent quantum Fisher information and entanglement depth of transient states of quantum materials with time-resolved resonant inelastic x-ray scattering. Using a quarter-filled extended Hubbard model as an example, we benchmark the efficiency of this approach and predict a light-enhanced many-body entanglement due to the proximity to a phase boundary. Our work sets the stage for experimentally witnessing and controlling entanglement in light-driven quantum materials via ultrafast spectroscopic measurements.

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Section: Methodsmentioning

confidence: 99%

Witnessing light-driven entanglement using time-resolved resonant inelastic X-ray scattering

et al. 2023

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“…Inelastic neutron scattering (INS) has traditionally been the method of choice for probing magnetic correlations. In recent years, however, resonant inelastic x-ray scattering (RIXS) has emerged as an important complementary technique [8][9][10][11][12][13][14][15][16][17][18][19]. Its large scattering cross section and element specificity are advantageous over INS for small sample volumes, as well as for complex systems with multiple magnetic elements [20,21].…”

mentioning

confidence: 99%

Unraveling higher-order contributions to spin excitations probed using resonant inelastic x-ray scattering

Kumar

Nag

et al. 2022

Phys. Rev. B

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Resonant inelastic x-ray scattering (RIXS) is an evolving tool for investigating the spin dynamics of strongly correlated materials, which complements inelastic neutron scattering. In isotropic spin-1 2 Heisenberg antiferromagnetic (HAFM) spin chains, both techniques have observed non-spin-conserving (NSC) excitations confined to the two-spinon phase space. However, a recent O K-edge RIXS study of the one-dimensional HAFM Sr 2 CuO 3 observed spin-conserving (SC) four-spinon excitations outside the two-spinon phase space. Here, we demonstrate that analogous four-spinon excitations can also be accessed at the Cu L 3 edge in the related material SrCuO 2 . Through detailed modeling, we establish that these excitations appear in both the SC and NSC channels of the Cu L 3 edge, and are only captured by higher-order terms in the ultrashort core-hole lifetime expansion. Since these terms encode information about spin-spin correlations extending beyond nearest neighbors, our results offer different possibilities for studying nonlocal spin correlations in quantum magnets.

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“…Inelastic neutron scattering (INS) has traditionally been the method of choice for probing magnetic correlations. In recent years, however, resonant inelastic x-ray scattering (RIXS) has emerged as an important complementary technique to INS [8][9][10][11][12][13][14][15][16][17][18][19]. Its large scattering cross-section and element specificity are advantageous over INS for small sample volumes, as well as for complex systems with multiple magnetic elements [20,21].…”

mentioning

confidence: 99%

Unraveling higher-order corrections in the spin dynamics of RIXS spectra

Kumar,

Nag,

et al. 2021

Preprint

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Resonant inelastic x-ray scattering (RIXS) is an evolving tool for investigating spin dynamics of strongly correlated materials, which complements inelastic neutron scattering. Both techniques have found that non-spin-conserving (NSC) excitations in quasi-1D isotropic quantum antiferromagnets are confined to the two-spinon phase space. Outside this phase space, only spin-conserving (SC) four-spinon excitations have been detected using O K-edge RIXS. Here, we investigate SrCuO2 and find four-spinon excitations outside the two-spinon phase space at both O K-and Cu L3-edges. Using the Kramers-Heisenberg formalism, we demonstrate that the four-spinon excitations arise from both SC and NSC processes at Cu L3-edge. We show that these new excitations only appear in the second-order terms of the ultra-fast core-hole lifetime expansion and arise from long-range spin fluctuations. These results thus open a new window to the spin dynamics of quantum magnets.

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Dynamical spin susceptibility in La2CuO4 studied by resonant inelastic x-ray scattering

Cited by 11 publications

References 53 publications

Witnessing light-driven entanglement using time-resolved resonant inelastic X-ray scattering

Witnessing light-driven entanglement using time-resolved resonant inelastic X-ray scattering

Unraveling higher-order contributions to spin excitations probed using resonant inelastic x-ray scattering

Unraveling higher-order corrections in the spin dynamics of RIXS spectra

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