Die DPG-Frühjahrstagung in Dresden musste abgesagt werden! Lesen Sie mehr ...

Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe

HL: Fachverband Halbleiterphysik

HL 42: Oxide semiconductors

HL 42.7: Vortrag

Mittwoch, 18. März 2020, 11:30–11:45, POT 51

Exciton Lattices in Curprous Oxide — •Martin Bergen — Experimentelle Physik 2, Technische Universität Dortmund, D-44221 Dortmund, Germany

Excitons are a heavily studied topic within the field of semiconductor physics and generally well understood. For example they can be created in highly excited states as so called Rydberg-excitons. This specific form of exciton is characterized by a large spatial extension and strong interaction between the excitons as well as external fields.
However, currently only a few select materials with comparatively large binding energies like cuprous oxide (Cu₂O) can be effectively studied. In Cu₂O excited states with principal quantum number up to n=25 can be observed, which corresponds to an exciton extension of over 2 µ m. Due to the large dipole-dipole interaction a so called Rydberg-blockade can be observed, which prevents the creation of additional excitons in the vicinity of already existing excitons.
In atom physics optical lattices with cold atoms are an often used tool to study the atom’s physics. In analogy to this our most recent findings on the influence of lattices on Rydberg-excitons in Cu₂O will be shown. One example is an enhanced Rydberg-blockade as compared to a homogeneous exciton distributon.