Spatiotemporal Stability of a Femtosecond Hard–X-Ray Undulator Source Studied by Control of Coherent Optical Phonons

Beaud, P.; Johnson, S. L.; Streun, A.; Abela, R.; Abramsohn, D.; Grolimund, Daniel; Krasniqi, Faton; Schmidt, Th.; Schlott, V.; Ingold, G.

doi:10.1103/physrevlett.99.174801

Cited by 186 publications

(82 citation statements)

References 19 publications

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“….). They are thought to be far more complex than in simple systems such as Bi (Beaud et al, 2007), as the Bi--Bi bondlength is the sole parameter to refine. Scientists now dream of reaching sub-atomic resolution and watching electronic reorganization on time-scales where atoms have no time to move, and so to cross the diabatic/adiabatic limit.…”

Section: Resultsmentioning

confidence: 99%

“…Several applications require sub-picosecond resolution to probe time-dependence of the intensity of the Bragg reflections. Observation of coherent atomic oscillations in a solid (Cavalleri et al, 2006;Fritz et al, 2007;Beaud et al, 2007;Sokolowski-Tinten et al, 2003) or ultra-fast surface melting (Rousse et al, 2001;Lindenberg et al, 2005) are frequently cited examples.…”

Section: Out Of Equilibrium Phenomena In Liesstmentioning

confidence: 99%

“…They pave the way for femtosecond X-ray crystallography, albeit with a low X-ray flux and rather limited experimental applications. However this new ultra-fast science is rapidly progressing around X-ray sources such as time-slicing technique (Schoenlein et al, 2000;Khan et al, 2006;Cavalleri et al, 2006;Johnson et al, 2007) or Linac-based synchrotron (Service, 2002;Lindenberg et al, 2005;Fritz et al, 2007) and new big facility projects are underway (X-FEL). For instance one can observe the coherent atomic motions induced by a light pulse, before the thermalization of the material.…”

Section: Introductionmentioning

confidence: 99%

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State of the art and opportunities in probing photoinduced phase transitions in molecular materials by conventional and picosecond X-ray diffraction

Collet¹,

Cointe²,

Lorenc³

et al. 2008

Zeitschrift Für Kristallographie - Crystalline Materials

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Abstract. The optical control of the macroscopic physical properties (magnetic, optical . . .) of a material by laser irradiation is gaining interest through the emerging field of photoinduced phase transitions. Light-induced changes of the macroscopic state of a material involves subtle coupling between the electronic and structural degrees of freedom, which are essential to stabilize the photo-excited state, different in nature from the stable state. Therefore the new experimental field of photocrystallography plays a key role. It goes far beyond simple structural analysis under laser excitation. By playing on different physical parameters and developing the techniques and analysis, one can investigate new out of equilibrium physics through light-driven cooperative dynamics and transformations in materials. This paper is reviewing different aspects of the use of photocrystallography to investigate the nature, the mechanisms and the dynamics of photoinduced phase transitions for photo-steady or long-lived states, as well as transformations driven by an ultra-short light pulse. We also give a brief overview on recent advances in time-resolved crystallography with 100 ps resolution.

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Section: Resultsmentioning

confidence: 99%

Section: Out Of Equilibrium Phenomena In Liesstmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

State of the art and opportunities in probing photoinduced phase transitions in molecular materials by conventional and picosecond X-ray diffraction

Collet¹,

Cointe²,

Lorenc³

et al. 2008

Zeitschrift Für Kristallographie - Crystalline Materials

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“…Therefore, to verify that the symmetry change occurs during the excitation process, we perform a pump-probe experiment on the excited state of the system below and above the phase transition threshold. Such a technique has been previously used to demonstrate the effects of damping of soft modes [25][26][27] . Figure 4 shows the results at a probe wavelength of 525 nm.…”

Section: Phonons During the Photoinduced Phase Transition In Vomentioning

confidence: 99%

Ultrafast changes in lattice symmetry probed by coherent phonons

et al. 2012

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The electronic and structural properties of a material are strongly determined by its symmetry. Changing the symmetry via a photoinduced phase transition offers new ways to manipulate material properties on ultrafast timescales. However, to identify when and how fast these phase transitions occur, methods that can probe the symmetry change in the time domain are required. Here we show that a time-dependent change in the coherent phonon spectrum can probe a change in symmetry of the lattice potential, thus providing an all-optical probe of structural transitions. We examine the photoinduced structural phase transition in Vo 2 and show that, above the phase transition threshold, photoexcitation completely changes the lattice potential on an ultrafast timescale. The loss of the equilibrium-phase phonon modes occurs promptly, indicating a non-thermal pathway for the photoinduced phase transition, where a strong perturbation to the lattice potential changes its symmetry before ionic rearrangement has occurred.

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“…If the probe is in the visible range, we usually measure either the induced changes in reflectivity or in transmission of the sample. If the probing wavelength is in the hard X-ray range, a diffraction pattern could be recorded and analyzed at different time delay (Sokolowski, 2003;Beaud, 2007;Rousse, 2001). Here, we will focus mainly on pump probe experiments using one laser pulse at a given wavelength for recovering the transient reflectivity .…”

Section: Set Up For Coherent Optical Phonon Studymentioning

confidence: 99%