Regensburg 2022 – scientific programme
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HL: Fachverband Halbleiterphysik
HL 13: Ultra-Fast Phenomena
HL 13.8: Talk
Tuesday, September 6, 2022, 11:30–11:45, H33
Clocking the dynamics of correlated Bloch electrons on an attosecond time scale — •Josef Freudenstein1, Markus Borsch2, Manuel Meierhofer1, Dmytro Afanasiev1, Christoph Peter Schmid1, Fabian Sandner1, Marlene Liebich1, Anna Girnghuber1, Matthias Knorr1, Mackillo Kira2, and Rupert Huber1 — 1University of Regensburg, 93051 Regensburg, Germany — 2University of Michigan, Ann Arbor, Michigan 48109, USA
Delocalized Bloch electrons and the low-energy correlations between them determine key properties of solids. To directly capture how many-body correlations affect the actual motion of Bloch electrons, sub-femtosecond temporal precision is desirable. Here, we study attosecond shifts in the dynamics of charge carriers at the Fermi level, combining sub-fs resolution with meV energy selectivity. Coherent excitons are injected in bulk and monolayer tungsten diselenide and subsequently accelerated by multi-terahertz light fields. Quasiparticle collisions lead to the emission of high-order sidebands, which contain key information about the ballistic dynamics of the charge carriers. We show how the excitonic binding energy, the strength of the driving field, the valley polarization and Pauli blocking influence these dynamics on an attosecond time scale and faithfully reproduce these results with quantum-dynamic many-body computations in a Wigner-function representation. This opens a new pathway to understanding emergent quantum dynamics and phases and sets a corner stone for future optoelectronics and quantum-information processing.