Berlin 2018 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 93: Focus Session: Structural Dynamics in Nanoscale Materials, Probed by Ultrafast Electron Pulses I
O 93.1: Hauptvortrag
Donnerstag, 15. März 2018, 10:30–11:00, HE 101
Ultrafast Electron Diffuse Scattering: Mapping Momentum Dependent Electron-Phonon Coupling and Nonequilibrium Phonon Dynamics in 2D Materials — •Bradley Siwick1,2, Martin Otto1, Laurent Rene de Cotret1, Mark Stern1, and Mark Sutton1 — 1McGill University, Department of Physics, Center for the Physics of Materials, Montreal, Canada — 2McGill University, Department of Chemistry, Montreal, Canada
The nature of the couplings within and between lattice and charge degrees of freedom is central to condensed matter and materials physics. These interactions are determining to phenomena as diverse as superconductivity, charge density waves and carrier mobility in semiconductors and metals. Despite their fundamental role, detailed momentum-dependent information on the strength of electron-phonon and phonon-phonon coupling across the entire Brillouin zone has proved elusive. This talk will describe a new technique, ultrafast electron diffuse scattering (UEDS), that can provide such information. Specific applications of UEDS to 2D materials will be presented.