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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.