Department of Physics and Astronomy, Michigan State University, East Lansing, MI 48824

Wednesday, January 17, 2018 - 3:00pm to 4:00pm

Speaker: Chong-Yu Ruan, MSU 

Program Description:

I will discuss a new concept of ultrafast electron microscopy to boost its signal dynamical range while maintaining femtosecond (fs) and sub-eV resolution by directly controlling its space-charge dynamics.  A key ingredient is the adaptive RF optics for phase space manipulation, resulting in high combined spatial, spectral, and temporal resolutions at the space-charge limits.  Utilizing the thus generated fs coherent electron beams, we (re)investigated the photo-induced meta-stable and hidden states in electronic crystals. We uncovered a surprising generality of self-organizing behavior emerging at nonequilibrium and the otherwise unresolved phonon dynamics in diffusive scattering.  These results demonstrate the utilities of the adaptive optics in a next-generation electron microscope, which may be extended to the MeV scale where more efficient control of space-charge dynamics is possible.


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