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SUMMARY:Beyond structure and composition: Multidimensional TEM as a key fo
 r imaging electric fields\, 3D shape and soft matter
DTSTART:20210930T140000
DTSTAMP:20260416T115339Z
UID:d0e69dd5815d6d3169273b98a8d092072184181b876cf2e40a5a667c
CATEGORIES:Conferences - Seminars
DESCRIPTION:Prof. Knut Müller Caspary - LMU Munich\nIn recent years\, the
  dimensionality in transmission electron microscopy (TEM) has increased ra
 pidly by the advent of ultrafast cameras that record at frame rates of man
 y kHz. This development has especially paved the way for a revolution as t
 o the versatility of scanning TEM (STEM). In particular\, momentum-resolve
 d STEM enhanced traditional Z- and phase-contrast techniques such that any
  conventional imaging mode is present simultaneously in a 4D data set. Mos
 t importantly\, the combination of real- and reciprocal space information 
 nowadays allows to quantify electric fields\, charge densities and potenti
 als with subatomic resolution\, to measure polarisation-induced electric f
 ields\, and to solve the phase problem by ptychographic techniques.\nIn th
 is presentation\, a brief review of quantitative STEM is given\, followed 
 by selected works on ultrafast detectors. We demonstrate the capability of
  4D-STEM using several examples such as the mapping of atomic electric fie
 lds in 2D materials and ptychographic reconstructions using different algo
 rithms. Moreover\, we report the recent development of focal series 4D STE
 M yielding insights into the scattering dynamics and 3D shape of specimen.
  The talk closes with prospects on ultrahigh time resolution for imaging (
 magnetic) dynamics at GHz frequencies\, and opportunities for high-contras
 t imaging of soft matter at low doses\, building a bridge between material
 s science methodology and life science challenges.\n\n\nBiosketch\nKnut M
 üller-Caspary received his Ph.D from Bremen University (Germany) in 2011.
  Between 2011 and 2016 he worked as a postdoctoral research fellow in Brem
 en focussing on strain\, composition and electric field mapping by momentu
 m-resolved STEM. He established cooperations with several companies to exp
 lore new detectors as to speed\, dynamic range\, efficiency and in-situ ca
 pability. In particular\, he contributed key developments to the mapping o
 f atomic electric fields and charge densities at subatomic scale by exploi
 ting the full complexity of STEM diffraction patterns. In 2016 Müller-Cas
 pary moved to the EMAT institute at the University of Antwerp (Belgium) wh
 ere he applied STEM to the electrical characterisation of 2D materials. In
  2018 he established a Helmholtz Young Investigator Group for momentum-res
 olved STEM at Forschungszentrum Jülich (Germany) and became junior profes
 sor at RWTH Aachen University in 2019. In 2021\, Knut Müller-Caspary move
 d to the faculty of chemistry and pharmacy at Ludwig-Maximilians-Universit
 y Munich as university professor for TEM.
LOCATION:https://epfl.zoom.us/j/2019908135
STATUS:CONFIRMED
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