Berlin 2018 – wissenschaftliches Programm
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HL: Fachverband Halbleiterphysik
HL 24: Poster Session II
HL 24.35: Poster
Dienstag, 13. März 2018, 18:30–20:30, Poster F
Spatio-temporal resolution studies on a highly compact femtosecond electron diffraction and understanding the phenomena of phonon decay in single crystalline graphite — Christian Gerbig1, Silvio Morgenstern1, Marlene Adrian1, Cristian Sarpe1, •Muhammad Abdullah Umer1, Arne Senftleben1, Matthias Wollenhaupt2, and Thomas Baumert1 — 1University of Kassel, Institute of Physics and Center for Interdisciplinary Nanostructure Science and Technology (CINSaT), D-34132 Kassel, Germany — 2University of Oldenburg, Institute of Physics, D-26111 Oldenburg, Germany
Ultrafast time resolved electron diffraction has become a promising technique because of its higher temporal and atomic scale spatial resolution and allow to study the ultrafast phenomena occurring in the atomic structure of matter with ultrafast precision.
We report here the application of ultrafast electron diffraction to study the dynamical processes in single crystalline graphite in order to understand the effect of phonon generation and decay mechanism which is being essential for future carbon based electron devices.
With our highly compact setup we are able to achieve excellent spatial- temporal resolution with coherence length >8nm and electron pulse duration <200 fs. We further present generation and decay processes of incoherent as well as coherent phonons in graphite as a function of film thickness down to few-layer graphene.