Direct imaging of ultrafast lattice dynamics

Brown, Shaughnessy; Gleason, A. E.; Galtier, E.; Higginbotham, Andrew; Arnold, Brice; Fry, Alan; Hashim, Akel; Schroer, Christian G.; Schropp, Andreas; Seiboth, Frank; Tavella, F.; Xing, Z.; Mao, Wendy L.; Lee, H. J.; Nagler, Bob

doi:10.1126/sciadv.aau8044

Cited by 41 publications

(20 citation statements)

References 38 publications

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“…The use of XFEL sources, which deliver high-flux Xray pulses (10 12 -10 13 photons at ∼6-25 keV over 50fs) within a narrow photon-energy bandwidth (∆E/E ∼ 2×10 −3 ), has been transformative for the study of dynamic material properties and high energy density (HED) science (47). Combined with high power laser drivers, this has allowed for measurements previously thought possible only when performed under static compression and integrated in time, including complex crystallography (8,13,25,26,30,60), precise spectroscopy (61), and high-resolution imaging (10,48,55) in single-shot dynamic compression experiments.…”

Section: Introductionmentioning

confidence: 99%

Development of slurry targets for high repetition-rate XFEL experiments

Smith,

Rastogi,

Lazicki

et al. 2022

Preprint

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Combining an x-ray free electron laser (XFEL) with high power laser drivers enables the study of phase transitions, equation-of-state, grain growth, strength, and transformation pathways as a function of pressure to 100s GPa along different thermodynamic compression paths. Future high-repetition rate laser operation will enable data to be accumulated at >1 Hz which poses a number of experimental challenges including the need to rapidly replenish the target. Here, we present a combined shock-compression and X-ray diffraction study on vol% epoxy(50)-crystalline grains(50) (slurry) targets, which can be fashioned into extruded ribbons for high repetition-rate operation. For shockloaded NaCl-slurry samples, we observe pressure, density and temperature states within the embedded NaCl grains consistent with observations for shock-compressed single-crystal NaCl.

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Section: Introductionmentioning

confidence: 99%

Development of slurry targets for high repetition-rate XFEL experiments

Smith,

Rastogi,

Lazicki

et al. 2022

Preprint

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“…Thus, time-resolved mapping of the interplay of lattice vibration with electronic motion on electronic timescale is essential to comprehend several ubiquitous phenomena in solids, such as structural phase transition [6,7], thermal [8,9] and optical properties [10][11][12]; and predicting new concepts in solids. Several spectroscopy and imaging-based methods are employed to probe lattice vibrations in solids [13][14][15][16][17][18][19][20].…”

Section: Introductionmentioning

confidence: 99%

Probing phonon-driven symmetry alterations in graphene via high-harmonic spectroscopy

Rana¹,

Dixit²

2022

Preprint

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High-harmonic spectroscopy has become an essential ingredient in probing various ultrafast electronic processes in solids with sub-cycle temporal resolution. Despite its immense importance, sensitivity of high-harmonic spectroscopy to phonon dynamics in solids is not well known. This work addresses this critical question and demonstrates the potential of high-harmonic spectroscopy in probing intertwined phonon-electron dynamics in solids. A pump pulse excites in-plane optical phonon modes in monolayer graphene and a circularly polarised pulse is employed to probe the excited phonon dynamics that generates higher-order harmonics. We show that the coherent phonon dynamics alters the dynamical symmetry of graphene with the probe pulse and leads the generations of the symmetry-forbidden harmonics. Moreover, sidebands associated with the prominent harmonic peaks are generated as a result of the coherent dynamics. It is found that the symmetries and the characteristic timescale of the excited phonon mode determine the polarisation and positions of these sidebands. Present work opens an avenue in time-resolved probing of phonondriven processes and dynamical symmetries in solids with sub-cycle temporal resolution.

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“…Cavity-based XFEL (CBXFEL) project is currently relying on 220 ns double pulse mode and X-ray Laser Oscillator (XLO) 24 will utilize trains of up to 8 pulses with 35 ns separation. Many Matter under Extreme Conditions (MEC) experiments also require up to 8 X-ray pulses with ≤ 1 ns separation [25][26][27] .…”

Section: Introductionmentioning

confidence: 99%

Two- and Multi-bucket X-ray Free-Electron Laser at LCLS

Decker

Bane

Colocho

et al. 2021

Preprint

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X-ray Free Electron Lasers provide femtosecond X-ray pulses with narrow bandwidth and unprecedented peak brightness. Special modes of operation have been developed to deliver double pulses for X-ray pump, X-ray probe experiments. However, the longest delay between the two pulses achieved with existing single bucket methods is less than 1 picosecond, thus preventing exploration of longer timescales dynamics. We present a novel Two-bucket scheme covering delays from 350 picoseconds to hundreds of nanoseconds in discrete steps of 350 picoseconds. Performance for each pulse can be similar to the one in single pulse operation. The method has been experimentally tested with LCLS-I and LCLS-II hard x-ray undulators.

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Direct imaging of ultrafast lattice dynamics

Cited by 41 publications

References 38 publications

Development of slurry targets for high repetition-rate XFEL experiments

Development of slurry targets for high repetition-rate XFEL experiments

Probing phonon-driven symmetry alterations in graphene via high-harmonic spectroscopy

Two- and Multi-bucket X-ray Free-Electron Laser at LCLS

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