Three Resonant Ultra-Cold Bosons: Off-Resonance Effects

Mattia Jona-Lasinio (1) , Ludovic Pricoupenko (2)

1 LENS - European Laboratory for Non-Linear Spectroscopy
2 LPTMC - Laboratoire de Physique Théorique de la Matière Condensée

We solve a finite range two-channel model for three resonant identical bosons. The model provides a minimal description of the various magnetic Feshbach resonances in single species ultra-cold bosonic systems, including off-resonant scattering. We obtain important insights into the interpretation of seminal experiments: the three-body recombination rate measured in Sodium and the Efimov resonances observed in Caesium. This approach quantifies non universal effects appearing for a finite magnetic field detuning.

Mots clés: Efimov states; Ultracold Bosons; Feshbach resonance; three-body recombination; three-body quantum problem; few-body physics

Domaines: Physique Quantique [quant-ph]; Autre [cond-mat.other]

Mattia Jona-Lasinio, Ludovic Pricoupenko. Three Resonant Ultra-Cold Bosons: Off-Resonance Effects. Physical Review Letters, 2010, 104, pp.023201. ⟨10.1103/PhysRevLett.104.023201⟩. ⟨hal-00369867v3⟩