Rostock 2019 – wissenschaftliches Programm

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A: Fachverband Atomphysik

A 11: Ultra-cold plasmas and Rydberg systems

A 11.11: Poster

Dienstag, 12. März 2019, 16:30–18:30, S Fobau Physik

Interaction of Rydberg excitons with thin electron-hole plasmas in cuprous oxide (Cu₂O) — •Sjard Ole Krüger and Stefan Scheel — Institut für Physik, Universität Rostock, D-18059 Rostock, Germany

Wannier excitons are bound electron-hole states inside semiconductors showing striking similarities to hydrogen atoms. The observation of their Rydberg states and signs of a Rydberg blockade in Cu₂O [1] has sparked a lot of research into their properties. Not unlike their atomic counterparts, Rydberg-excitons are very sensitive to the existence of a plasma in their surrounding. It has been shown that plasma densities of less than one electron-hole pair per one hundred exciton volumes may suffice to ionise the Rydberg excitons [2]. Such electron-hole plasmas can be created by a variety of processes, like Auger-decay of ground-state excitons and direct or phonon-assisted excitations of unbound electron-hole pairs. It is therefore necessary to develop a good understanding of the plasma induced effects in order to distinguish them from the sought after exciton-exciton interactions such as the Rydberg blockade. In our poster, we investigate the ionisation of the Rydberg excitons in Cu₂O via the micro-fields induced by the plasma’s free charges in a static Stark-interaction model.

[1] T. Kazimierczuk et al., Nature 514, 343 (2014).

[2] J. Heckötter et al., Phys. Rev. Lett. 121, 097401 (2018).