Ruprecht Karls Universit├Ąt Heidelberg

Fermionization of Two Distinguishable Fermions

In our latest paper we make two distinguishable atoms behave as if they were fermions, and verify this by comparing them to two identical fermionic atoms. The paper has been selected as an editor's suggestion by PRL, and was highlighted by a Physics synopsis:
http://physics.aps.org/synopsis-for/10.1103/PhysRevLett.108.075303
2 distinguishable vs. 2 identical atoms
2 distinguishable vs. 2 identical atoms



Paper on deterministic preparation of few fermion systems published

We sucessfully prepared a tunable quantum system consisting of one to ten fermions. We prepare such a system using ultracold Lithium atoms in a micrometer sized optical dipole trap. Due to Pauli's principle one quantum state in the trap is occupied with one atom per spin state (red and blue balls). By tilting the trap we can control the number of remaining quantum states and thus the number of particles.

Schematic preparation scheme of the tunable few-fermion system
Schematic preparation scheme of the tunable few-fermion system


The paper is published in the current issue of Science. The ArXiv version can be found here and there is also a press release (in German) by the University of Heidelberg.



New Bubble Chamber at the MPI-K

The ultracold quantum gases group proudly present its new bubble chamber implemented at the Max-Planck Institute. Due to space constraints it has been temporarily placed inside Selim's office.



Another diploma thesis finished

Philipp Simon recently handed in his diploma thesis, which further characterizes the new MOT and Zeeman slower and can be found here:



Paper about Radio-Frequency Association of Efimov Trimers published

We have associated an univeral three-body bound state, so called Efimov state, and measured its binding energy as a function of interaction strength with radio-frequency spectroscopy.
The paper has been published in the current issue of Science. The arxiv version can be found here.


Signal of the trimer association (red points) for different interaction strengths.
Signal of the trimer association (red points) for different interaction strengths.


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