Mainz 2026 – scientific programme

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A: Fachverband Atomphysik

A 26: Poster – Ultracold Matter (joint session Q/A)

A 26.24: Poster

Wednesday, March 4, 2026, 17:00–19:00, Philo 2. OG

Experimental setup for trapping ultracold atoms near 4K solid state samples — •Valerie Leu, Julia Gamper, Cedric Wind, Wolfgang Alt, and Sebastian Hofferberth — Institute of Applied Physics, University of Bonn, Germany

In our experiment we are developing an experimental platform that couples Rydberg atoms to an electromechanical resonator on an atom chip operated in a cryogenic environment. To support the use of interchangeable atom chips, both the experimental apparatus and the cryostat must be engineered so that the chip assembly can be mechanically decoupled from the surrounding system, ensuring reliable removal and replacement of the chips.

This poster presents our progress on constructing this platform. The setup consists of a region for trapping and cooling rubidium atoms in a magneto-optical trap, as well as a cryogenic stage in which the atoms will be coupled to an electromechanical resonator integrated on the atom chip. We describe the design of the cryogenic system and the implementation of a rail-based mechanism that allows the system to be opened, the atom chip to be inserted or exchanged, and the entire assembly to be closed again in a controlled and reproducible manner. This will allow future studies of Rydberg atoms near 4 K surfaces and pave the way for initial experiments on coupling of the atoms to an on-chip microwave source.

Keywords: Rydberg Atoms; Hybrid Systems; Cryostat; Electromechanical resonator