Ultracold Projects

Institut für Experimentalphysik,
University of Innsbruck, and
Austrian Academy of Sciences,
Innsbruck, Austria

Experiments:   RbCsLevT  /  CsIII  /  FeLiKx  /  Erbium  /  PoCeMoN   /  DyK


RbCs: Ultracold polar RbCs molecules

L. Reichsöllner, A. Schindewolf, T. Takekoshi, F. Ferlaino, R. Grimm, and H.-C. Nägerl

In this experiment we investigate the properties of a Bose-Bose mixture of  87Rb and 133Cs atoms. An ultracold sample of this mixture is prepared all-optically. First Zeeman-slowed, the atoms are then loaded into a two-color MOT. After being cooled even further by two-color degenerate Raman sideband cooling they are hold in a crossed dipole trap. To reach degeneracy other cooling and evaporation steps are taken. more info...

With an integrated highly polished glass prism the experimental setup was formerly capable and used for investigating 2D quantum systems (more information: GOST).



LevT: Tunable BEC of cesium and molecular quantum gases

B. Huang, L. Sidorenkov, H.-C. Nägerl, F. Ferlaino, and R. Grimm

This project investigates tunable Bose-Einstein condensates (BEC) with cesium (Cs) atoms and the generation of molecular quantum gases from such BECs. Using a Levitated dipole Trap we have been able to create the first BEC of Cs in 2002. Further scientific breakthroughs have been  the production of pure molecular quantum gases in 2003 and the observation of Efimov quantum states in 2005. more info



CsIII: A second generation Cs Bose-Einstein condensation experiment

F. Meinert, K. Lauber, E. Kirilov, and H.-C. Nägerl  

This project is funded by the START-prize awarded to Hanns-Christoph Nägerl in 2003. The goal of this project is to set up a new-generation high-brightness source for tuanble Cs matter waves to be used in precision measurements involving atom interferometers and non-classical states of matter waves in three-dimensional lattice potentials. more info



FeLiKx: Stronlgy interacting fermionic mixtures of Li an K

M. Jag, R. Lous, I. Fritsche, M. Cetina, and R. Grimm

We are setting up an experiment to study ultracold gas mixtures of lithium, potassium and strontium. The principal goal is to study the BEC-BCS transition between a BEC of heteronuclear molecules of fermionic atoms and a BCS gas of heteronuclear Cooper pairs. The machine is designed to span a wide range of different quantum gases: we can choose between eight different isotopes, among them three fermions, and we can work with two alkaline and one alkaline earth element. This opens the stage for many other experiments, e.g. possibly the Bose-Einstein condensation of potassium-39 or strontium or optical Feshbach resonances in an alkaline/alkaline-earth mixture. The technology used for this setup is an augmented and improved version of the one used for the existing lithium-6 machine.



Erbium: exploring exotic magnetic quantum gases

A. Frisch, S. Baier, K. Aikawa, M. J. Mark, R. Grimm and F. Ferlaino

This project investigates highly magnetic quantum gases with erbium (Er) atoms. Erbium is an extremely heavy (166 a.u.) and strongly magnetic (7 µB) rare-earth atom with a rich isotopic variety and a complex energy level structure. The unique combination of interesting properties allows studies of dipolar effects where the anisotropic and long-range dipole-dipole interactions dominating over the simple isotropic contact interaction. more info




K-Cs: Fermionic quantum matter, quantum mixtures, and dipolar molecules under a microscope

G. Anich, G. Unnikrishnan, M. Gröbner, and H.-C. Nägerl

The latest project in the research group of Prof. H.-C. Nägerl is aimed at studying quantum gas mixtures of cesium (Cs) and potassium (K). Mixed quantum gases offer a wealth of research opportunities, ranging from precision measurements to studies of various quantum many-body regimes. The research presently focuses on two main directions that both complement each other: Dipolar quantum matter and topological quantum matter. Within the first line of research, we aim to build a molecular quantum simulator based on ultracold polar KCs ground-state molecules. Our goal is to study novel types of dipolar quantum matter in optical lattice geometries under a high-resolution microscope that shall allow us to observe the molecules with single-site resolution. Within the second line of research, we aim at realizing exotic quantum many-body phases of fermionic and bosonic mixtures in lattice geometries with non-trivial band structures. Presently, we are focusing on ultracold bosons with tunable interactions loaded into two-dimensional Lieb lattices. Such a system is particularly interesting because it features two dispersive bands that form a Dirac cone and a flat band that intersects the Dirac point. A topological state of matter that is exclusively driven by interactions is expected to form. more info




DyK: Mixtures of dysprosium and potassium

S. Tzanova, C. Ravensbergen, and R. Grimm

more info soon


last change: 22-01-18 by AS