Berlin 2015 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 71: Surface Dynamics
O 71.3: Poster
Mittwoch, 18. März 2015, 18:15–21:00, Poster A
The role of non-equilibrium dynamics in photo-induced phase transitions of correlated materials — •S. Eich1, S. Mathias1, J. Urbancic1, A.V. Carr2, A. Stange3, S. Michael1, T. Popmintchev2, T. Rohwer3, M. Wiesenmayer1, A. Ruffing1, S. Jakobs1, S. Hellmann3, P. Matyba2, C. Chen2, L. Kipp3, M. Bauer3, M.M. Murnane2, H.C. Schneider1, K. Rossnagel3, H.C. Kapteyn2, and M. Aeschlimann1 — 1TU Kaiserslautern and Research Center OPTIMAS, 67663 Kaiserslautern, Germany — 2JILA, University of Colorado and NIST, Boulder, Colorado 80309-0440, USA — 3Institute of Experimental and Applied Physics, University of Kiel, 24098 Kiel, Germany
We use femtosecond extreme-ultraviolet time- and angle-resolved photoelectron spectroscopy to study the ultrafast photo-induced suppression of the charge-density wave (CDW) in 1T-TiSe2. In the following non-equilibrium electron dynamics after femtosecond laser excitation, we see that hot-carrier multiplication is the primary driver for the ultrafast CDW suppression. As soon as the optically excited carriers have relaxed to a quasi-equilibrium hot Fermi-distribution electron gas, the CDW suppression stops. Theoretical calculations of the hot-carrier scattering processes and the screening properties further link the carrier multiplication to the observed CDW gap dynamics.