中国物理B ›› 2011, Vol. 20 ›› Issue (12): 120311-120311.doi: 10.1088/1674-1056/20/12/120311
铁璐, 薛具奎
Tie Lu(铁璐) and Xue Ju-Kui(薛具奎)†
摘要: The nonlinear Landau-Zener tunneling and nonlinear Rabi oscillations of Bose-Einstein condensate (BEC) with higher-order atomic interaction between the Bloch bands in an accelerating optical lattice are discussed. Within the two-level model, the tunneling probability of BEC with higher-order atomic interaction between Bloch bands is obtained. We finds that the tunneling rate is closely related to the higher-order atomic interaction. Furthermore, the nonlinear Rabi oscillations of BEC with higher-order atomic interaction between the bands are discussed by imposing a periodic modulation on the level bias. Analytical expressions of the critical higher-order atomic interaction for suppressing/enhancing the Rabi oscillations are obtained. It is shown that the critical value strongly depends on the modulation parameters (i.e., the modulation amplitude and frequency) and the strength of periodic potential.
中图分类号: (Dynamic properties of condensates; collective and hydrodynamic excitations, superfluid flow)