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SUMMARY:Imaging the Properties of Atoms and Fields at the Picometer Scale
DTSTART:20221124T160000
DTEND:20221124T170000
DTSTAMP:20260920T164839Z
UID:4915d88d63e325f9096c38741ecaad5dd9edc3ea0316409dee522797
CATEGORIES:Conferences - Seminars
DESCRIPTION:Prof. David Muller\, Cornell University\nAbstract:\nElectron 
 microscopes use electrons with wavelengths of a few picometers\, and are p
 otentially capable of imaging individual atoms in solids at a resolution u
 ltimately set by the intrinsic size of an atom. Until very recently\, the 
 best resolution was more than an order magnitude worse than this limit. 
  This was caused by two things – first the intrinsic aberrations in ele
 ctron lenses are much worse than for optical lenses – comparable to usin
 g a beer bottle as a magnifying glass. Second\, electrons are multiply-sca
 ttered inside the sample – a process described by Hans Bethe over 90 yea
 rs ago. It’s been a headache for electron microscopists ever since\, but
  with our recent advances in detector technology [1] and reconstruction a
 lgorithms we have been able to solve the inverse scattering problem and th
 e resolution of the electron microscope is now limited only by the dose to
  the sample\, and thermal vibrations of the atoms themselves [2].  These
  approaches have also allowed us to image the internal structures of both 
 magnetic and ferroelectric vortices\, skyrmions and merons\, including the
 ir singular points that are critical for accurately describing the topolog
 ical properties of these field textures.\n\n[1] M. W. Tate\, P. Purohit\, 
 D. Chamberlain\, K. X. Nguyen\, R. Hovden\, C. S. Chang\, P. Deb\, E. Turg
 ut\, J. T. Heron\, D. G. Schlom\, D. C. Ralph\, G. D. Fuchs\, K. S. Shanks
 \, H. T. Philipp\, D. A. Muller\, and S. M. Gruner. “High Dynamic Range 
 Pixel Array Detector for Scanning Transmission Electron Microscopy” Mic
 roscopy and Microanalysis 22\, (2016): 237–249. \n[2] Z. Chen\, Y. Jia
 ng\, Y.-T. Shao\, M. E. Holtz\, M. Odstrčil\, M. Guizar-Sicairos\, I. Han
 ke\, S. Ganschow\, D. G. Schlom\, and D. A. Muller. “Electron Ptychograp
 hy Achieves Atomic-Resolution Limits Set by Lattice Vibrations” Science
  372\, (2021): 826–831 \n\n\nBiography:\nDavid Muller is the Samue
 l B. Eckert Professor of Engineering in the School of Applied and
  Engineering Physics at Cornell University\, and co-director of the
  Kavli Institute for Nanoscale Science at Cornell. Muller received his B
 Sc degree from the University of Sydney\, his PhD degree in physics from C
 ornell\, and was a research scientist at Bell Labs from 1997-2003.
   His research interests include new electron microscopy methods for
  the atomic-scale control and characterization of matter.  His gro
 up’s inventions and advances in new microscopy technology have led to t
 hree Guinness World Records: for the highest resolution microscope\, the 
 worlds’ thinnest sheet of glass (at only a monolayer) and the world’s
  smallest walking robot. \n\nHe is a fellow of both the American Physic
 al Society and the Microscopy Society of America\, and recipient of the M
 icroscopy Society of America Burton Medal\, the Microanalysis Society Dun
 cumb Award\, and the Ernst Ruska prize from the German Society for Electro
 n Microscopy.
LOCATION:https://epfl.zoom.us/j/2019908135
STATUS:CONFIRMED
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