Probing light-driven quantum materials with ultrafast resonant inelastic X-ray scattering

Mitrano, Matteo; Wang, Yao

doi:10.1038/s42005-020-00447-6

Cited by 54 publications

(34 citation statements)

References 121 publications

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“…The advent of X-ray free-electron lasers (FEL) (Emma et al, 2010;Seddon et al, 2017) has led to another burst of quantum materials studies, benefiting from femtosecond pulses of Ångstrom wavelength and increased brilliance. We refer to in-depth reviews on ultrafast X-ray scattering (Buzzi et al, 2018) and resonant inelastic X-ray scattering (Cao et al, 2019;Mitrano and Wang, 2020).…”

Section: Discussionmentioning

confidence: 99%

Colloquium: Nonthermal pathways to ultrafast control in quantum materials

Torre

Kennes²,

Claassen³

et al. 2021

Rev. Mod. Phys.

250

128

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We review recent progress in utilizing ultrafast light-matter interaction to control the macroscopic properties of quantum materials. Particular emphasis is placed on photoinduced phenomena that do not result from ultrafast heating effects but rather emerge from microscopic processes that are inherently nonthermal in nature. Many of these processes can be described as transient modifications to the free energy landscape resulting from the redistribution of quasiparticle populations, the dynamical modification of coupling strengths and the resonant driving of the crystal lattice. Other pathways result from the coherent dressing of a material's quantum states by the light field. We discuss a selection of recently discovered effects leveraging these mechanisms, as well as the technological advances that led to their discovery. A road map for how the field can harness these nonthermal pathways to create new functionalities is presented.

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Section: Discussionmentioning

confidence: 99%

Colloquium: Nonthermal pathways to ultrafast control in quantum materials

Torre

Kennes²,

Claassen³

et al. 2021

Rev. Mod. Phys.

250

128

View full text Add to dashboard Cite

show abstract

“…phonon Floquet 57 , ligand manipulation 7 , multi-band dynamical effects 58,59 , and coupling to cavities 60,61 might lead to harder spin fluctuations and increased pairing 47,62 . Future polarizationdependent trRIXS experiments and theoretical calculations will be key to investigate these photoinduced spin dynamics in a wide variety of quantum materials 63,64 .…”

Section: Discussionmentioning

confidence: 99%

X-ray scattering from light-driven spin fluctuations in a doped Mott insulator

et al. 2021

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Manipulating spin fluctuations with ultrafast laser pulses is a promising route to dynamically control collective phenomena in strongly correlated materials. However, understanding how photoexcited spin degrees of freedom evolve at a microscopic level requires a momentum- and energy-resolved characterization of their nonequilibrium dynamics. Here, we study the photoinduced dynamics of finite-momentum spin excitations in two-dimensional Mott insulators on a square lattice. By calculating the time-resolved resonant inelastic x-ray scattering cross-section, we show that an ultrafast pump above the Mott gap induces a prompt softening of the spin excitation energy, compatible with a transient renormalization of the exchange interaction. While spin fluctuations in a hole-doped system (paramagnons) are well described by Floquet theory, magnons at half filling are found to deviate from this picture. Furthermore, we show that the paramagnon softening is accompanied by an ultrafast suppression of d-wave pairing correlations, indicating a link between the transient spin excitation dynamics and superconducting pairing far from equilibrium.

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“…A lower CT gap will also increase the exchange interaction and, hence, the characteristic spin fluctuation energy [94]. These effects might quantitatively explain the enhancement of superconducting correlations in photoexcited La 2−x Ba x CuO 4 [88,89] and could be resolved in future time-resolved RIXS experiments [95,96].…”

Section: Discussionmentioning

confidence: 90%

Ultrafast renormalization of the onsite Coulomb repulsion in a cuprate superconductor

Baykusheva,

Jang,

Husain

et al. 2021

Preprint

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Ultrafast lasers are an increasingly important tool to control and stabilize emergent phases in quantum materials. Among a variety of possible excitation protocols, a particularly intriguing route is the direct light-engineering of microscopic electronic parameters, such as the electron hopping and the local Coulomb repulsion (Hubbard U ). In this work, we use time-resolved xray absorption spectroscopy to demonstrate the light-induced renormalization of the Hubbard U in a cuprate superconductor, La1.905Ba0.095CuO4. We show that intense femtosecond laser pulses induce a substantial redshift of the upper Hubbard band, while leaving the Zhang-Rice singlet energy unaffected. By comparing the experimental data to time-dependent spectra of single-and three-band Hubbard models, we assign this effect to a ∼ 140 meV reduction of the onsite Coulomb repulsion on the copper sites. Our demonstration of a dynamical Hubbard U renormalization in a copper oxide paves the way to a novel strategy for the manipulation of superconductivity, magnetism, as well as to the realization of other long-range-ordered phases in light-driven quantum materials.

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Probing light-driven quantum materials with ultrafast resonant inelastic X-ray scattering

Cited by 54 publications

References 121 publications

Colloquium: Nonthermal pathways to ultrafast control in quantum materials

Colloquium: Nonthermal pathways to ultrafast control in quantum materials

X-ray scattering from light-driven spin fluctuations in a doped Mott insulator

Ultrafast renormalization of the onsite Coulomb repulsion in a cuprate superconductor

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