Berlin 2012 – scientific programme
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O: Fachverband Oberflächenphysik
O 35: Poster Session II (Polymeric biomolecular films; Nanostructures; Electronic structure; Spin-orbit interaction; Phase transitions; Surface chemical reactions; Heterogeneous catalysis; Particles and clusters; Surface magnetism; Electron and spin dynamics; Surface dynamics; Methods; Electronic structure theory; Functional molecules)
O 35.94: Poster
Tuesday, March 27, 2012, 18:15–21:45, Poster B
Time-resolved femtosecond Se 3d core level spectroscopy in the Mott insulator TiSe2 — •Hatem Dachraoui1, Tobias Milde1, Michael Porer2, Norbert Müller1, Recardo Manzke3, Walter Pfeiffer1, Rupert Huber2, and Ulrich Heinzmann1 — 1Molecular and Surface Physics, Faculty of Physics, Bielefeld University, Germany — 2Ultrafast Quantum Electronics and Photonics, Faculty of Physics, Regensburg University, Germany — 3Elektronische Eigenschaften und Supraleitung, Faculty of Physics, Humboldt-University Berlin, Germany
Strongly correlated materials exhibit interesting dynamics and phase transitions for which the underlying mechanisms are still under debate. Fs-laser induced dynamics provide information about the phase transition mechanism. The recent progress in the creation of femtosecond EUV pulse generation (by means of high harmonic Generation HHG) offers the feasibility of time-resolved core level photoelectron spectroscopy which is capable of probing ultra-fast light driven processes at surfaces. Here we use 20 fs EUV-pulses to directly study the ultrafast dynamics of the charge density wave in TiSe2 after near-infrared excitation (1.5 eV). Structural transitions, evidenced by a dynamic shift of Se 3d core-levels, occurs before electrons lattice thermalization is established.