Hannover 2020 – scientific programme
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Q: Fachverband Quantenoptik und Photonik
Q 15: Quantum gases (Bosons) II
Q 15.2: Talk
Tuesday, March 10, 2020, 11:30–11:45, e214
Atoms trapped by atoms — •Matthias Meister1 and Wolfgang P. Schleich1,2 — 1Institut für Quantenphysik and Center for Integrated Quantum Science and Technology (IQST), Universität Ulm, D-89069 Ulm, Germany — 2Institut für Quantentechnologien, Deutsches Zentrum für Luft- und Raumfahrt (DLR), D-89077 Ulm, Germany
In general, ultra-cold quantum gases are trapped by external magnetic or optical fields to prevent the atoms from expanding. However, in microgravity the different atom-atom interactions available in dual-species Bose-Einstein condensates (BECs) enable us to create a situation, where one atomic species is confined solely by the repulsive interaction with another species.
Our approach [1] is based on a dual-species mixture, where one species fully surrounds the other resulting in a shell-shaped ground state. By selectively trapping only the outer species and raising the inter-species interaction a potential wall forms preventing the inner species from escaping. We have thoroughly studied this process numerically and have analyzed the holding time of this newly formed atom trap as a function of the system parameters. In particular, the quality of the confinement depends on the geometry of the initial state, favoring isotropic setups.
This project is supported by the German Space Agency DLR with funds provided by the Federal Ministry for Economic Affairs and Energy (BMWi) under grant number 50WP1705.
[1] M. Meister, PhD thesis, Universität Ulm, Ulm (2019)