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SUMMARY:IMX Colloquium - Ultrafast Electron Microscopy and Free-Electron Q
 uantum Optics
DTSTART:20260511T131500
DTEND:20260511T141500
DTSTAMP:20260524T110817Z
UID:f5266abe2d2446b059e22209659993bcb6f44b22e4522cc6824d8a68
CATEGORIES:Conferences - Seminars
DESCRIPTION:Prof. Claus Ropers\, Max Planck Göttingen\, Germany\nProvidi
 ng the most detailed views of atomic-scale structure and composition\, Tra
 nsmission Electron Microscopy (TEM) serves as an indispensable tool for st
 ructural biology and materials science. The combination of electron micros
 copy with pulsed electrical or optical stimuli allows for the study of tra
 nsient phenomena\, involving magnetization dynamics\, strain evolution and
  structural phase transformations. Ultrafast transmission electron microsc
 opy (UTEM) is a pump-probe technique\, which tracks non-equilibrium proces
 ses with simultaneous femtosecond temporal and nanometer to atomic-scale s
 patial resolutions.\nThis talk will introduce UTEM based on laser-triggere
 d field emitters\, and will provide application examples\, such as the rea
 l-space imaging of structural phase transitions [1] and the coherent mappi
 ng of optical fields [2]. Beyond time-resolved imaging\, light-coupled TEM
 s also serve as testbeds for free-electron quantum physics\, facilitating 
 the study of electron-electron [3\,4] as well as electron-photon [5] corre
 lations and entanglements [6].\nReferences:\n[1] "Ultrafast nanoimaging of
  the order parameter in a structural phase transition”\, Th. Danz\, T. 
 Domröse\, C. Ropers\, Science 371\, 6527 (2021)\n[2] J. H. Gaida et al.\,
  “Attosecond electron microscopy by free-electron homodyne detection”\
 , Nature Photonics 18\, 509–515 (2024).\n[3] R. Haindl et al.\, “Coulo
 mb-correlated electron number states in a transmission electron microscope
  beam”\, Nature Physics 19\, 1410–1417 (2023).\n[4] R. Haindl et al.\,
  “Femtosecond and Attosecond Phase-Space Correlations in Few-Particle Ph
 otoelectron Pulses”\, Phys. Rev. Lett. 135\, 165002 (2025).\n[5] A. Aren
 d et al.\, “Electrons herald non-classical light“\, Nature Physics 21\
 , 1855–1862 (2025).\n[6] J.-W. Henke et al.\, “Observation of quantum 
 entanglement between free electrons and photons”\, arXiv:2504.13047(2025
 ).\n\nBio: Claus Ropers studied physics in Göttingen and at the Universi
 ty of California\, Berkeley. He completed his PhD at the Max Born Institut
 e and the Humboldt University Berlin in 2007\, and became assistant profes
 sor in back in Göttingen in 2008.  Since 2020\, he has been Director at 
 the Max Planck Institute for Multidisciplinary Sciences. His interests lie
  in the development of ultrafast electron microscopy and the study of nano
 scale light-matter interactions and free-electron quantum optics.
LOCATION:MXF 1 https://plan.epfl.ch/?room==MXF%201
STATUS:CANCELLED
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