Visualizing electron-phonon and phonon-phonon coupling in momentum and time with ultrafast electron scattering

Bradley J. Siwick

doi:10.1117/12.2651467

15 March 2023 Visualizing electron-phonon and phonon-phonon coupling in momentum and time with ultrafast electron scattering

Bradley J. Siwick

Author Affiliations +

Proceedings Volume 12419, Ultrafast Phenomena and Nanophotonics XXVII; 1241904 (2023) https://doi.org/10.1117/12.2651467
Event: SPIE OPTO, 2023, San Francisco, California, United States

Abstract

The nature of the couplings within and between lattice and charge degrees of freedom is central to the physics of materials. These interactions are essential to phenomena as diverse as superconductivity, charge density waves and carrier mobility in semiconductors and metals. Despite their fundamental role, detailed momentum-dependent information on the strength of electron-phonon coupling (EPC) and phonon-phonon coupling (PPC) across the entire Brillouin zone has proved to be very difficult to obtain experimentally. An emerging pump-probe technique, ultrafast electron diffuse scattering (UEDS), provides such information from the perspective of the phonon system directly. The application of this technique to EPC related phenomena in a wide variety of layered materials has recently been demonstrated.

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Bradley J. Siwick "Visualizing electron-phonon and phonon-phonon coupling in momentum and time with ultrafast electron scattering", Proc. SPIE 12419, Ultrafast Phenomena and Nanophotonics XXVII, 1241904 (15 March 2023); https://doi.org/10.1117/12.2651467

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