The Investigation Of Ultracold Fermi Gases In Spin-orbit Coupling And Background Scattering

In recent years,with the development of science and technology,cold atom gas in the spin-orbit coupling has became a hot topic attracted people's attention,which have a lot of breakthrough in theory and experiment.When we add the spin-orbit coupling the cold atoms also show some special properties.Ultracold atoms have been developed as a practical tool for studying multi-body physics.The interaction between atoms and the atoms themselves all can be effectively controlled.The scattering length between the two atoms also can be precisely adjusted to any value by the Feshbach resonance of the magnetic field.In this paper,we explore the properties of spin1/2 ultracold Fermi gases on Feshbach resonance under different strengths of background scattering and spin-orbit coupling.By using two-channel model and mean-field theory,we show that behavior of Fermi atoms is remarkably influenced by the coupling strength between the closed and the open channels.In the same case,we find that if the channel coupling strength tends to vanish,the behavior of the two-channel model perfectly coincides with the single-channel model.We find that the resonance coupling width between the two channels and spin-orbit coupling interaction have a competition for the superuid order parameter which very efficiently can be tuned by the background scattering strength.We also find that there is a considerable change in the molecular signature of bound-state under different controlling parameters.For instance,with the increase of the spin-orbit coupling strength,the number of Feshbach molecules is almost unchanged at first.However,as soon as the spin-orbit coupling strength passes through a certain value,the number of molecules begin to increase rapidly.