Dresden 2006 – wissenschaftliches Programm
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DF: Dielektrische Festkörper
DF 9: Phase Transitions
DF 9.1: Hauptvortrag
Donnerstag, 30. März 2006, 09:30–10:10, M{\"U}L Elch
Driving a macroscopic state switching into materials with a laser pulse and probing atoms moving in real time with a X-ray pulse — •CAILLEAU Herve1,2, COLLET Eric1,2, BURON Marylise1,2, LEMEE-CAILLEAU Marie-Helene3, and KOSHIHARA Shin-ya2,4 — 1Groupe Matiere Condensee et Materiaux, Cnrs-Université Rennes 1, F 35042 Rennes Cedex, France — 2ERATO, JST, Japan — 3Institut Lauë-Langevin, Grenoble, France — 4Tokyo Institute of Technology, Tokyo, Japan
The possibility of controlling with a single ultra-short laser pulse the coherent and cooperative transformation of the state of atoms or molecules in solid state opens new avenues in materials science. This challenge of driving a macroscopic state switching on an ultra-fast time scale, so realizing at the material level what has been done at the molecular level in femto-chemistry, goes beyond the current principles. Indeed, these new out-of-equilibrium processes are highly cooperative and highly non-linear. In other words, light can induce self-amplification and self-organization processes in the material, a so-called photoinduced phase transition. Molecular materials are particularly promising by virtue of light tuning of the charge state and/or spin state in molecules. Another new step is the recent possibly to directly observe in real time the assembly of molecules in a solid moving in a regimented way towards the new electronic and structural order by using the emerging ultra-fast X-ray diffraction. Reference: * Photoinduced Phase Transitions*, K. Nasu ed., World Scientific (2004).