Feshbach resonances in atomic Bose–Einstein condensates

George Edwin Cragg, Arthur K. Kerman

Qiao An-qin

In the field of Bose Einstein condensation,Feshbach resonance is the focus of study,which has been observed in many experiments.By way of Feshbach resonance of atomic scattering through regulating external magnetic field,the interaction between atoms is changed so that strong attraction and strong repelling are realized.This paper mainly talks about Feshbach resonance,Bose gas of strong interaction and Bose-Einstein condensation of fermionic atom pair.

JM Johnny Vogels

Zhang, Fan, Yin, Lan

Recent repoet on the formation of two-dimensional Bose-Einstein condensates (BECs) of spinning g-wave molecules is surprise. Here we study quantum phase transition in the quasi-2D atomic Bose gas with a g-wave Feshbach resonance, and show that there are two phase transitions in this system: from a phase with only a atomic Bose-Einstein condensate to a phase with coexistence of atomic and molecular condensation and from the coexistence phase to a phase with only a molecular Bose-Einstein condensate. We show that the g-wave resonance Feshbach has two features in the phase transitions, a phase with only a atomic Bose-Einstein condensate is no longer forbidden and resonance effects appear only at levels beyond the mean-field. We determine the T=0 beyond mean-field phase diagram of the gas as a function of magnetic field and molecular condensation density. We also detemine the ratio of atomic to molecular condensation in the coexistence phase, which can be tested in experiments.

S. Inouye, Michael R. Andrews, J. Stenger +3 more

C. Yüce, Abidin Kılıç

The Gross-Pitaevskii gain equation is used to model atom laser and Bose-Einstein condensation (BEC) fed by the surrounding thermal cloud. It is shown that the number of atoms continuously injected into BEC from the reservoir can be controlled by applying the external magnetic field via Feshbach resonance.