平均场在光晶格中玻色-爱因斯坦凝聚体Bloch振荡中的作用及谐波阱
Role of the Mean-field in Bloch Oscillations of a Bose-Einstein Condensate in an Optical Lattice and Harmonic Trap
摘要：
利用Crank-Nicholson方法研究了玻色-爱因斯坦凝聚体在光晶格和谐波阱中的演化。通过将冷凝物从谐波阱的中心移位来激发冷凝物。平均场在足够大的初始位移后发生的布洛赫振荡中起着重要的作用。我们发现，一个适度的平均场显着抑制的凝聚在动量空间中的色散。当平均场变大时，凝聚波函数中出现孤子和涡旋结构。
英文摘要：
Using the Crank-Nicholson method, we study the evolution of a Bose-Einstein condensate in an optical lattice and harmonic trap. The condensate is excited by displacing it from the center of the harmonic trap. The mean field plays an important role in the Bloch-like oscillations that occur after sufficiently large initial displacement. We find that a moderate mean field significantly suppresses the dispersion of the condensate in momentum space. When the mean field becomes large, soliton and vortex structures appear in the condensate wavefunction.
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