Light-control of materials via nonlinear phononics

Subedi, Alaska

doi:10.5802/crphys.44

Cited by 10 publications

(4 citation statements)

References 64 publications

(147 reference statements)

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“…It also opens new opportunities for controlling magnetic properties of Prussian Blue Analogues on demand, using for instance nonlinear phononics strategies. 61,62…”

Section: Discussionmentioning

confidence: 99%

Detection of a Jahn–Teller mode as an ultrafast fingerprint of spin-transition-induced charge transfer in CoFe Prussian Blue Analogue

Hervé,

Marekha,

Mazerat

et al. 2024

Mater. Adv.

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“…It also opens new opportunities for controlling magnetic properties of Prussian Blue Analogues on demand, using for instance nonlinear phononics strategies. 61,62…”

Section: Discussionmentioning

confidence: 99%

Detection of a Jahn–Teller mode as an ultrafast fingerprint of spin-transition-induced charge transfer in CoFe Prussian Blue Analogue

Hervé,

Marekha,

Mazerat

et al. 2024

Mater. Adv.

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“…The present study therefore sheds new light on the coupled photoinduced electronic and structural dynamics at play in Prussian Blue Analogues. It also opens new opportunities for controlling magnetic properties of Prussian Blue Analogues on demand, using for instance nonlinear phononics strategies 59,60 .…”

Section: Discussionmentioning

confidence: 99%

Detection of a Jahn-Teller Mode as an Ultrafast Fingerprint of Spin-transition-induced Charge Transfer in CoFe Prussian Blue Analogue

Hervé,

Marekha,

Mazerat

et al. 2023

Preprint

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Photoinduced spin transition is one of the fastest processes occurring in transition-metal-based molecules and materials, reaching down to tens of femtoseconds (1 fs = 1015 s). The underlying dynamics have been well characterized for mononuclear Fe(II) spin-crossover (SCO) complexes, where it was shown that the spin transition can induce coherent activation of metal-ligand breathing and bending vibrational modes, identified as the main reaction coordinates. While precise characterization of the femtosecond nuclear wave packet brings rich information on photoinduced spin transitions, it is scarcely explored in bimetallic Prussian Blue Analogues (PBAs). In this work, we performed transient absorption spectroscopy with sub-20 fs time resolution on the [Cs0.7Co(Fe(CN)6)0.9] PBA to unravel high-frequency coherent structural dynamics, which is interpreted as the activation of a low-symmetry CoN6 Jahn-Teller mode at 12 THz. This coherent fingerprint shows that the photoexcitation initially drives motion along the Jahn-Teller coordinate before the spin transition occurs, i.e., over less than 50 fs. These results are in stark contrast with conventional activation of fully-symmetric breathing modes reported for several SCO compounds, thus providing new insights on the ultrafast spin-transition-induced charge transfer dynamics in PBAs.

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“…where γ IR and γ R are the corresponding damping constants, approximately 10-20% of the respective phonon frequencies 40 .…”

Section: Coupled Phonons Dynamics and Electronic State Transitionmentioning

confidence: 99%

Anti-Jahn-Teller effect induced ultrafast insulator to metal transition in perovskite BaBiO3

et al. 2022

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The Jahn-Teller (JT) effect involves the ions M with a degenerate electronic state distorting the corner-sharing MO6 octahedra to lift the degeneracy, inducing strong coupling of electrons to lattice, and mediating the exotic properties in perovskite oxides. Conversely, the anti-Jahn–Teller (AJT) effect refers to the deformation against the Jahn-Teller-distorted MO6 octahedra. However, it is difficult to experimentally execute both effects descending from the fine-tuning of crystal structures. We propose the AJT can be introduced by THz laser illumination at 11.71 THz in a candidate superconducting perovskite material BaBiO3 near room temperature. The illumination coherently drives the infrared-active phonon that excites the Raman breathing mode through the quadratic-linear nonlinear interaction. The process is characterized by the emergence of an AJT effect, accompanied by an insulator-to-metal transition occurring on the picosecond timescale. This study underlines the important role of crystal structure engineering by coherent phonon excitation in designing optoelectronic devices.

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Light-control of materials via nonlinear phononics

Cited by 10 publications

References 64 publications

Detection of a Jahn–Teller mode as an ultrafast fingerprint of spin-transition-induced charge transfer in CoFe Prussian Blue Analogue

Detection of a Jahn–Teller mode as an ultrafast fingerprint of spin-transition-induced charge transfer in CoFe Prussian Blue Analogue

Detection of a Jahn-Teller Mode as an Ultrafast Fingerprint of Spin-transition-induced Charge Transfer in CoFe Prussian Blue Analogue

Anti-Jahn-Teller effect induced ultrafast insulator to metal transition in perovskite BaBiO3

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