Hannover 2020 – wissenschaftliches Programm

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A: Fachverband Atomphysik

A 25: Ultra-cold plasmas and Rydberg systems II (joint session A/Q)

A 25.3: Vortrag

Donnerstag, 12. März 2020, 14:45–15:00, a320

Extended coherently delocalized states in a frozen Rydberg gas — •Ghassan Abumwis, Matthew T. Eiles, and Alexander Eisfeld — Max Planck Institute for the Physics of Complex Systems, Dresden, Germany

The long-range dipole-dipole interaction between excited Rydberg states of atoms can create highly delocalized states due to the exchange of excitation between the atoms. We show that even in a random gas many of the single-exciton eigenstates are surprisingly delocalized, composed of roughly one quarter of the participating atoms. We identify two different types of eigenstates: one which stems from strongly-interacting clusters, resulting in localized states, and one which extends over large delocalized networks of atoms. These two types of states can be excited and distinguished by appropriately tuned microwave pulses, and their relative contributions can be modified by the Rydberg blockade. The presence of these delocalized eigenstates could be relevant to puzzling results in several current experiments.