Physikalisches Kolloquium: Catching the wave - Optical Traps for controlling lons & Ultracold Atoms in the quantum regime
Time
Tuesday, 25. January 2022
15:15 - 16:45
Location
A 701
Organizer
FB Physik / Prof. Dr. Peter Baum
Speaker:
Prof. Dr. Tobias Schätz / Albert-Ludwigs-Universität Freiburg
Isolating ions and atoms from the environment is essential for experiments, especially if we aim to study quantum effects. For decades, this has been achieved by trapping ions with radiofrequency (rf) fields and neutral particles with optical fields. We are trapping ions by the interaction with light and electrostatic fields, in absence of any rf-fields. We take our results as starting point for studying how to combine the advantages of optical trapping and ions.
In the first part of the talk, we will focus on the basics of optically trapping ions. In the second part we aim to demonstrate the prospects of our approach in the context of interaction and reaction at ultra-low temperatures as a showcase. Following the seminal work in other groups in hybrid traps, we embed optically trapped ions into quantum gases to reach lowest temperatures, circumventing the currently inevitable excess kinetic energy in hybrid traps, where ions are kept but also driven by rf-fields. It permits to enter the temperature regime where quantum effects are dominating and controllable via Feshbach reonances.
We will discuss our recent results on optically trapping 138Ba+, 87Rb and 6Li atoms in hybrid- and bi-chromatic dipole traps, related challenges and perspectives.