Host: Melanie Müller

Investigating Ultrafast Electron and Phonon Dynamics at the Atomic Scale

Electrons, phonons, and their mutual interactions are crucial for the complex phenomena in strongly correlated materials. In this talk, I will show that electron and phonon dynamics can be investigated at the atomic scale by combining THz pump-probe spectroscopy and a scanning tunneling microscope (STM) [1,2]. [more]

Sub-molecular Imaging of Light-matter Interaction

  • FHI/IMS Joint Online Seminar
  • Date: May 9, 2022
  • Time: 11:00 AM (Local Time Germany)
  • Speaker: Anna Rosławska
  • Université de Strasbourg, CNRS, IPCMS
  • Host: Melanie Müller
Light-matter interaction plays a crucial role in the quantum properties of light emission from single molecules, and in electron-to-photon and photon-to-electron energy conversions. Such mechanisms are usually probed using optical methods, which are, however, spatially limited by diffraction to a few hundred nanometers. [more]

Vibrational exciton and polaron nano-imaging: a molecular ruler to image structure, coupling, and disorder in functional molecular materials

Properties and functions of molecular materials often emerge from intermolecular interactions and associated nanoscale structure and morphology. However, defects and disorder give rise to confinement and many-body localization of the associated wavefunction, disturbing the performance of, e.g., molecular electronic or photonic materials. Conventional microscopy and even nanoscopy lack spatio-spectral sensitivity to the low-energy and molecular length scales of intermolecular interactions, carrier-phonon coupling, and polaron formation, thus leaving a missing link between material structure and observed heterogeneity in the electronic or photonic response.We address these outstanding problems in several novel combinations of spatio-spectral and spatio-temporal infrared nano-imaging. [more]
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