Nonlinear effect of cold Cs2 molecular conversion from ultracold atoms in a tunneling four-level structure

Due to the inevitability of the nonlinear collision between the particles in the experiment of the ultracold atomic condensates, it is of great significance to study the nonlinear effect for producing the ultracold molecules from the atomic condensates. In this work, we investigate theoretically the nonlinear effect induced by the two-body collision for producing ultracold Cs2 molecules from ultracold atoms by the stimulated Raman adiabatic passage in a tunneling four-level structure. Under the two-photon resonance condition and the coherent population trapping state, the conversion efficiency is influenced significantly by the nonlinear parameter. Meanwhile, the optimized parameter ranges of the resonance tunneling strength at the unstable excited molecular states, the effective Rabi frequencies of the two-laser fields and the detuning of pump field for different nonlinear parameter are suggested to obtain the high conversion efficiency of ground Cs2 molecules. At last, the maximum conversion efficiency up to 88.56% can be realized in the optimized parameter ranges.The accepted manuscript in pdf format is listed with the files at the bottom of this page. The presentation of the authors' names and (or) special characters in the title of the manuscript may differ slightly between what is listed on this page and what is listed in the pdf file of the accepted manuscript; that in the pdf file of the accepted manuscript is what was submitted by the author