Time-Resolved X-Ray Diffraction from Coherent Phonons during a Laser-Induced Phase Transition

Lindenberg, A. M.; Kang, Ilnam; Johnson, S. L.; Mißalla, T.; Heimann, Philip; Chang, Zenghu; Larsson, Jörgen; Bucksbaum, Philip H.; Kapteyn, Henry C.; Padmore, H. A.; Lee, R. W; Wark, J. S.; Falcone, R. W.

doi:10.1103/physrevlett.84.111

Cited by 345 publications

(186 citation statements)

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“…In most cases, the femtosecond excitation pulse interacts with the electronic system of the material and the stress driving the lattice motions is generated more or less impulsively via electron-phonon coupling [9][10][11][12][13]. In bulk materials, the spatial stress profile is mainly determined by the pump beam geometry and the optical penetration depth.…”

Section: Introductionmentioning

confidence: 99%

Ultrafast structural dynamics of perovskite superlattices

et al. 2009

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Femtosecond x-ray diffraction provides direct insight into the ultrafast reversible lattice dynamics of materials with a perovskite structure. Superlattice (SL) structures consisting of a sequence of nanometer-thick layer pairs allow for optically inducing a tailored stress profile that drives the lattice motions and for limiting the influence of strain propagation on the observed dynamics. We demonstrate this concept in a series of diffraction experiments with femtosecond time resolution, giving detailed information on the ultrafast lattice dynamics of ferroelectric and ferromagnetic superlattices. Anharmonically coupled lattice motions in a SrRuO 3 /PbZr 0.2 Ti 0.8 O 3 (SRO/PZT) SL lead to a switch-off of the electric polarizations on a time scale of the order of 1 ps. Ultrafast magnetostriction of photoexcited SRO layers is demonstrated in a SRO/SrTiO 3 (STO) SL.

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Section: Introductionmentioning

confidence: 99%

Ultrafast structural dynamics of perovskite superlattices

et al. 2009

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“…Their sensitivity is limited to valence electrons and vibrational features, respectively. On the other hand, direct insights into photo-induced structural dynamics can be achieved using ultrashort X-ray [25][26][27][28] or electron [29][30][31][32] probe pulses, which are nowadays available at synchrotron facilities and high-energy electron sources, respectively. Using this approach, it is possible to obtain a molecular movie of a given photoprocess, i.e.…”

Section: Introductionmentioning

confidence: 99%

Synchrotron ultrafast techniques for photoactive transition metal complexes

Borfecchia

Garino

Salassa

et al. 2013

Phil. Trans. R. Soc. A.

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In the last decade, the use of time-resolved X-ray techniques has revealed the structure of lightgenerated transient species for a wide range of samples, from small organic molecules to proteins. Time resolutions of the order of 100 ps are typically reached, allowing one to monitor thermally equilibrated excited states and capture their structure as a function of time. This review aims at providing a general overview of the application of timeresolved X-ray solution scattering (TR-XSS) and time-resolved X-ray absorption spectroscopy (TR-XAS), the two techniques prevalently employed in the investigation of light-triggered structural changes of transition metal complexes. In particular, we herein describe the fundamental physical principles for static XSS and XAS and illustrate the theory of timeresolved XSS and XAS together with data acquisition and analysis strategies. Selected pioneering examples of photoactive transition metal complexes studied by TR-XSS and TR-XAS are discussed in depth.

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“…Figures 1 and 2 show measured and simulated evolution of the normalized 002-Bragg reflectivity R ; t =R 0 (R 0 : reflectivity of heterostructure before laser pump) of the laser heated GaSb=InAs MQW at two different x-ray energies, E 1 16:37 keV and E 2 16:49 keV, corresponding to two different locations on the rocking curve. The patterns are considerably different from the very periodic and rather slowly developing pattern from a laser excited bulk crystal [11,14], which is shown in the inset. This is a direct consequence of phonon branch folding.…”

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confidence: 95%