In 2008 already, the Innsbruck physicists found Feshbach resonances in an ultracold gas mixture consisting of lithium and potassium atoms, which they have used to modify quantum mechanical interactions between particles in a controlled way by applying a magnetic field. In the meantime, they have overcome all technical challenges and are now the first to also produce strong interactions between those particles. “The magnetic fields have to be adjusted precisely to one in 100000 and controlled accurately to achieve this result,“ explains Florian Schreck.
In the experiment the physicists prepare the ultracold gases of lithium-6 (Li) and potassium-40 (K) atoms in an optical trap and overlap them, with the smaller cloud of heavier K atoms residing in the centre of the Li cloud. After turning off the trap, the researchers observe the expansion of the quantum gases at different magnetic fields. “When the particles show a strong interaction, the gas clouds behave hydrodynamically,“ says Schreck. “An elliptical nucleus is formed in the centre of the particle cloud, where the potassium and lithium atoms interact. Moreover, the expansion velocity of the particles, which are different initially, become equal.“ According to theory, both phenomena suggest hydrodynamic behavior of the quantum gas mixture. “This behavior is the most striking phenomenon observed in quantum gases, when particles strongly interact,“ says Rudolf Grimm. “Therefore, this experiment opens up new research areas in the field of many-body physics.“
New possibilities for exciting experiments
High energy physicists have made these two observations as well when producing quark-gluon plasmas in particle accelerators. The Innsbruck quantum gas experiment can be regarded as a model system to investigate cosmic phenomena that occurred immediately after the Big Bang. “In addition and above all, we can also use this system to address many questions of solid-state physics,“ says Rudolf Grimm, who is going to further explore the quantum gas mixture with his research group. “The big goal is to produce quantum condensates, such as Bose-Einstein condensates consisting of molecules made up of lithium and potassium atoms. This will tremendously increase our capabilities to realize novel states of matter.”
The physicists have published their findings in the scientific journal Physical Review Letters. Their work is supported by the Austrian Science Fund (FWF) and the Special Research Area FoQuS, the European Science Foundation ESF within the framework of EuroQUAM, the Wittgenstein award granted by the FWF and the Austrian Ministry of Science.