R&D – To observe quantum chaos, the physicists in Innsbruck cool erbium atoms to a few hundred nanokelvin and load them in an optical dipole trap composed of laser beams. They then influence the scattering behavior of the particles by using a magnetic field.
After holding the atoms in the trap for 400 msec, the researchers record the atom number remaining in the trap. Thus, the scientists are able to determine at which magnetic field two atoms are coupled to form a weakly-bound molecule.
At this magnetic field, so-called Fano-Feshbach resonances emerge. After varying the magnetic field in each experimental cycle and repeating the experiment 14,000 times, the physicists identified 200 resonances.
“We were fascinated by how many resonances of this type we found. This is unprecedented in the physics of ultracold quantum gases,” says Francesca Ferlaino’s team member Albert Frisch. more> http://tinyurl.com/q6f2hm4