The BCS-BEC crossover is a phenomenon exhibited by certain systems with tunable interactions that smoothly connects a state exhibiting Bardeen-Cooper-Schrieffer superconductivity to one exhibiting Bose Einstein condensatation.
Early work was done by D. M. Eagle and Anthony Leggett. Mohit Randeria.
In 2003, BCS-BEC crossover physics was studied experimentally in ultracold gases of lithium and potassium by changing the interaction strength using a Feshbach resonance. It was found that these systems exhibit extremely high superfluid transition temperatures at the Feshbach resonance. This point is unique because the only length scale in the problem is that given by the Fermi momentum, and is frequently referred to as unitarity, or a unitary Fermi gas.
References
See Also
- Bose–Einstein condensate
- Bardeen-Cooper-Schrieffer theory of superconductivity
- Quark–gluon plasma
- Neutron star
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