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O: Fachverband Oberflächenphysik

O 83: Poster Focus Session: Structural Dynamics in Nanoscale Materials, Probed by Ultrafast Electron Pulses

O 83.1: Poster

Mittwoch, 14. März 2018, 18:15–20:30, Poster A

Energy relaxation and dissipation in laser-excited thin film heterostructures — •K. Sokolowski-Tinten¹, R. Li², A. H. Reid², X. Shen², Q. Zheng², T. Chase², M. Milnikel¹, R. Coffee², J. Corbett², H. Dürr², N. Hartmann², C. Hast², R. Hettel², M. Horn-von Hoegen¹, D. Janoschka¹, M. Jermann¹, M. Ligges¹, I. Makasyuk², M. Mo², F. Quirin¹, B. Rethfeld³, S. Salamon¹, A. Terwey¹, T. Veccione², U. von Hörsten¹, S. P. Weathersby², H. Wende¹, C. Witt¹, and X. Wang² — ¹Faculty of Physics and Center for Nanointegration (CENIDE), University of Duisburg-Essen, Lotharstr. 1, 47057 Duisburg, Germany. — ²SLAC Nat. Acc. Lab., Menlo Park, USA. — ³Dep. of Physics and OPTIMAS Research Center, TU Kaiserslautern, Germany

We use time-resolved MeV transmission electron diffraction experiments to study the incoherent structural response of nanoscale materials after fs laser excitation. Experiments were carried out using the MeV Ultrafast Electron Diffraction (UED) facility recently established at SLAC [1]. UED@SLAC provides ultrashort <300fs electron pulses at relativistic energies (3-5 MeV), which we have used for precise measurements of the transient Debye-Waller-effect in different metal-insulator and metal-metal-heterostructures, highlighting the importance of interface [2] and transport effects.

[1] S. P. Weathersby et al., Rev. Sci. Instrum. 86, 073702 (2015).

[2] K. Sokolowski-Tinten et al., New J. Phys. 17, 113047 (2015); Struct. Dyn. 4, 054501 (2017).