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O: Fachverband Oberflächenphysik

O 93: Focus Session: Structural Dynamics in Nanoscale Materials, Probed by Ultrafast Electron Pulses I

O 93.2: Invited Talk

Thursday, March 15, 2018, 11:00–11:30, HE 101

Beyond Debye-Waller Effects in Ultrafast Electron Diffraction — •Xijie Wang — SLAC National accelerator Labotorary, Menlo Park, CA 94025, USA

Transient Debye Waller-effects has been used extensively for studying energy relaxation and lattice heating in laser excited materials in time-resolved X-ray or electron diffraction. In this talk, I will discuss the latest developments in MeV ultrafast electron diffraction and its applications for structure dynamics. Taking advantage negligible multiple scattering of MeV electrons in the materials, we successfully extended the transient Debye*Waller-effects to study the energy relaxation and transport in nano-scale heterostructure, ripples and energy relaxation in 2-D materials and phonon-phonon coupling in diffuse scattering. I will also discuss multi-modal studies of quantum materials at SLAC MeV UED.