Related Experiment Video
Updated: Apr 6, 2026

Cooling an Optically Trapped Ultracold Fermi Gas by Periodical Driving
Published on: March 30, 2017
Connecting Berezinskii-Kosterlitz-Thouless and BEC Phase Transitions by Tuning Interactions in a Trapped Gas
Richard J Fletcher1, Martin Robert-de-Saint-Vincent1, Jay Man1
1Cavendish Laboratory, University of Cambridge, J. J. Thomson Avenue, Cambridge CB3 0HE, United Kingdom.
Abstract:
We study the critical point for the emergence of coherence in a harmonically trapped two-dimensional Bose gas with tunable interactions. Over a wide range of interaction strengths we find excellent agreement with the classical-field predictions for the critical point of the Berezinskii-Kosterlitz-Thouless (BKT) superfluid transition. This allows us to quantitatively show, without any free parameters, that the interaction-driven BKT transition smoothly converges onto the purely quantum-statistical Bose-Einstein condensation transition in the limit of vanishing interactions.
Related Concept Videos
Phase Transitions: Vaporization and Condensation
Phase Transitions: Melting and Freezing
Entropy Changes Accompanying Specific Processes
Phase Transitions
Phase Transitions
Kinetic Theory of an Ideal Gas
The number of molecules in one mole is called...

