Derivation of Hydrodynamics for the Gapless Mode in the BEC-BCS Crossover from the Exact One-Loop Effective Action
Abstract
We derive generalized two-superfluid continuity equations for the BEC-BCS crossover in the presence of a Feshbach resonance at T=0. In addition, we calculate the velocity of sound throughout both BCS and Bose-Einstein condensation (BEC) regimes.
- Publication:
-
Physical Review Letters
- Pub Date:
- January 2007
- DOI:
- arXiv:
- arXiv:cond-mat/0606243
- Bibcode:
- 2007PhRvL..98b0603L
- Keywords:
-
- 05.70.Fh;
- 03.65.Yz;
- 03.70.+k;
- Phase transitions: general studies;
- Decoherence;
- open systems;
- quantum statistical methods;
- Theory of quantized fields;
- Condensed Matter - Other;
- High Energy Physics - Phenomenology
- E-Print:
- Four pages, 1 figure. Whereas v.2 contained additional references, but was otherwise unchanged, this new version contains new material concerning our ability to provide a hydrodynamical description of the BEC/BSC system. This explains the change of title. Our old results are unaffected