Barankov R A, Levitov L S
Department of Physics, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, Massachusetts 02139, USA.
Phys Rev Lett. 2004 Sep 24;93(13):130403. doi: 10.1103/PhysRevLett.93.130403. Epub 2004 Sep 22.
Degenerate Fermi gas interacting with molecules near a Feshbach resonance is unstable with respect to the formation of a mixed state, in which atoms and molecules coexist as a coherent superposition. A theory of this state is developed using a mapping to the Dicke model, treating the molecular field in the single mode approximation. The results are accurate in the strong coupling regime relevant for current experimental efforts. The exact solution of the Dicke model is exploited to study stability, phase diagram, and nonadiabatic dynamics of the molecular field in the mixed state.
在费什巴赫共振附近与分子相互作用的简并费米气体对于混合态的形成是不稳定的，在该混合态中原子和分子作为相干叠加态共存。利用与狄克模型的映射关系，在单模近似下处理分子场，发展了该态的理论。结果在与当前实验工作相关的强耦合区域是精确的。利用狄克模型的精确解研究了混合态中分子场的稳定性、相图和非绝热动力学。
