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Ultracold atoms: Model kits for quantum matter

Ultracold atoms: Model kits for quantum matter

This video was recorded at Dnevi Jožefa Stefana na Institutu "Jožefa Stefana". Atomic samples with temperatures in the nanokelvin range, prepared by advanced methods of laser and evaporative cooling, offer unique opportunities to study a large variety of phenomena in complex quantum systems. The important degrees of freedom and parameters can be controlled in a way, not accessible to traditional quantum many-body systems. Both bosonic and fermionic atoms are available to create Bose-Einstein condensates, degenerate Fermi gases, and even quantum-degenerate mixtures. Optical traps allow the experimentalists to realize macroscopic traps, artificial crystals ("optical lattices"), and low-dimensional environments. The interaction can be magnetically tuned exploiting a resonance phenomenon, called "Feshbach resonance". Based on this rich tool-box, many intriguing model systems can be experimentally studied with strong connections to different branches of physics. After a general introduction into the field, I will present a few examples based on research in Innsbruck, including new developments on strongly interacting Fermi gases and few-body "Efimov" states in Bose gases.

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