Hannover 2020 – scientific programme

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A: Fachverband Atomphysik

A 28: Poster Session - Atomic Physics IV

A 28.33: Poster

Thursday, March 12, 2020, 16:00–18:00, Empore Lichthof

Rydberg impurity dynamics in Bose-Einstein Condensates — •Sebastian Wüster — Indian Institute of Science Education and Research (IISER) Bhopal

Rydberg atoms can be excited embedded in a Bose-Einstein Condensate (BEC) under controlled conditions, to study the coupling to phonons [1] and formation of polarons [2].

We theoretically study the short-time non-equilibrium dynamics of the coupled BEC-Rydberg system, using Gross-Pitaevskii and ogoliubov theory, and show that the BEC can act as a tracking device for Rydberg motion, akin to a Bubble chamber [3].

When the Rydberg atom is brought into a superposition of electronic states, the different coupling of the Rydberg electron to the condensate environment in those states will lead to decoherence. The resultant hybrid open quantum system then constitutes a rare occasion where both, system and environment are highly controllable and their dynamics can be read out in detail.

[1] J. B. Balewski et al. Nature 502, 664 (2013).

[2] F. Camargo et al. Phys. Rev. Lett. 120, 083401 (2018).

[3] S. Tiwari and S. Wüster, Phys. Rev. A. 99, 043616 (2019)