Berlin 2015 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 84: Focus Session: Structural Dynamics in Nanoscale Materials Probed by Ultrashort Electron Pulses

O 84.10: Vortrag

Donnerstag, 19. März 2015, 18:00–18:15, MA 005

Ultrafast Electron Diffraction on nano-crystalline Graphene — •Silvio Morgenstern, Christian Gerbig, Marlene Adrian, Cristian Sarpe, Arne Senftleben, and Thomas Baumert — Universität Kassel, Institut für Physik und CINSaT, D - 34132 Kassel, Germany

In carbon layered materials the electronic subsystem, stimulated by high currents or optical excitations, is strongly coupled to a small set of optical phonons which limits the ballistic conductance. A detailed understanding of phonon decay mechanism is thus essential in improving the performance of carbon based future devices [1,2]. Time-resolved diffracton experiments using x-rays or electrons probes, has become a promising technique to directly provide insights into fundamental dynamics in solids at the microscopic level and on the pico- to subpicosecond timescale [3,4]. In this contribution we present results on photo-induced structural dynamics in single layer nano-crystalline graphene [5] obtained whit our compact and well characterized Ultrafast Electron Diffractometer [6] and discuss the influence of the main strutural properties for our results[7].

[1]T.Kampfrath et.al.,Phys.Rev.Lett.95,187403(2005)

[2]S.Schäfer et.al.,New J.Phys.13,063030(2011)

[3]A.H.Zewail,J.Phys.Chem.98,2782-2796(1994)

[4]B.Siwick et.al.,Science Vol.302,No.5649,1382-1385(2003)

[5]A.Turchanin,ACS Nano Vol.5,No.5,3896(2001)

[6]C.Gerbig et.al.,in submission

[7]S.Morgenstern et.al.,in preparation