# Cryogenic fermi microscope

We are currently hiring master and PhD students on this project. If you are interested to develop the next generation quantum gas microscope, contact Christian.

## The motivation

Ultracold quantum gases are routinely produced in a XHV vacuum environment, which provides very good isolation from the environment and ensures their “quantumness” for long times. This isolation however is not perfect and collisions with background gases (mainly hydrogen) pose a fundamental limit to the lifetime of the system with important impact on the evaporative cooling process.

On the one hand, background gas collisions randomly remove particles from the systems, which triggers thermalization in the many-body system and results in heating. On the other hand, “near miss” collisions may be not effective enough to cleanly eject a single particle from the gas but instead impart a significant amount of energy in secondary collisions. Both processes fundamentally limit the effectiveness of the evaporative cooling and hence the achievable temperatures.

In this very young project we plan to combine cryogenic techniques with a quantum gas microscope to challenge the low temperature frontier for ultracold Fermions which currently lies around 5% of the Fermi temperature.