Quantum effects on curve crossing in a Bose-Einstein condensate
Quantum effects on curve crossing in a Bose-Einstein condensate
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玻色-爱因斯坦凝聚体中曲线交叉的量子效应
DOI：
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发表时间：
2001
期刊：
影响因子：
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通讯作者：
Nist
中科院分区：
文献类型：
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作者：
V. Yurovsky;A. Ben;P. S. J. Itamp;H. R. D. O. Chemistry;Tel Aviv University Atomic Physics Division;Nist
在平均场近似下，研究了分子凝聚体解离或原子凝聚体中非弹性碰撞形成原子对的随时间变化的曲线交叉过程。由自发过程形成的原子的辐射率由Landau-Zener公式乘以由于量子多体效应的指数放大因子来描述。相关原子对在压缩态中形成。受激过程的速率取决于两个场的相对相位。
Formation of atomic pairs by the dissociation of a molecular condensate or by inelastic collisions in an atomic condensate due to a time-dependent curve crossing process is studied beyond the mean-field approximation. Thenumber of atoms formed by the spontaneous process is described by a Landau-Zener formula multiplied by an exponential amplification factor due to quantum many-body effects. Correlated atomic pairs are formed in squeezed states. The rate of stimulated processes depends on the relative phase of the two fields.