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O: Fachverband Oberflächenphysik

O 2: Key Note I

O 2.1: Plenary Talk

Monday, March 1, 2021, 10:00–10:30, Audimax

Chasing excited electrons in energy, momentum space, and time — •Martin Aeschlimann — University of Kaiserslautern (TUK) and Research Center OPTIMAS, Erwin-Schroedinger-Str. 46, 67663 Kaiserslautern, Germany

Optically excited (hot) electrons play a crucial role for many fundamental chemical and physical processes occurring at surfaces, interfaces, and in bulk materials. Despite decades of intense research, however, a complete picture of the hot electrons dynamic in its collective environment is still elusive. In this presentation, I will demonstrate how the latest developments in ultrafast light sources and photoemission detector technology have paved the way towards a completely new generation of time-resolved photoemission experiment based on time-, (and spin-) resolved momentum microscopy [1,2]. With this tool at hand, we can directly watch the temporal evolution of excited carriers in energy, momentum space, and time, which provides an unprecedented view onto the fundamental energy-, and (angular-) momentum-dissipation mechanisms in condensed matter. As exemplary cases, I will focus on the excited state dynamics of low dimensional materials and metal-molecular hybrid systems [3].

[1] B. Yan et al; Nature Communications 6, 10167 (2015)

[2] F. Haag et al, Rev. Sci. Instrum., 90 ,103104 (2019)

[3] F. Haag et al, arXiv:2101.03567 (2020)