Promotionsvortrag Physik: „Quantum electron optics in ultrafast light-matter interaction at metal needle tips: from electron number statistics to electron-electron correlations“

Ankündigung des Promotionsvortrags von: Herrn Jonas Heimerl

Metal needle tips are an ideal tool for answering fundamental questions in ultrafast light-matter interaction, such as how electrons are liberated from metal surfaces and driven by femtosecond laser fields. This research has deepened our understanding of electron dynamics down to time scales of attoseconds. However, experiments using metal needles have mainly focused on single electron dynamics. In my thesis, I showed how we can expand the description of multi-electron emission from metal needle tips by transferring quantum optical concepts such as photon correlations and photon number statistics.

First, I demonstrate how two electrons interact when they are emitted within one optical pulse with a pulse duration of only 12 fs. We observe that the probability of measuring two electrons with the same energy is strongly suppressed, i.e., the electron energies are anti-correlated.

The resulting energy difference of 3 eV can be explained by Coulomb repulsion, a surprisingly large value given that only two electrons interact. Second, I show that the electron number statistics can be changed by the photon number statistics of the triggering light pulse. For coherent (classical) light sources, we observe Poissonian electron number distributions, whereas for bright squeezed vacuum (non-classical light), we observe a broad, generalized Gamma distribution.

(Vortrag auf Englisch)

Dem Vortrag schließt sich eine Diskussion von 15 Minuten an. Vortrag und Diskussion sind öffentlich. Diesen Verfahrensteilen folgt ein nicht öffentliches Rigorosum von 45 Minuten.