Band YB, Trippenbach M, Burke JP, Julienne PS
Department of Chemistry, Ben-Gurion University of the Negev, Beer-Sheva, Israel 84105 and National Institute of Standards and Technology, 100 Bureau Drive, Stop 8423, Gaithersburg, Maryland 20899, USA.
Phys Rev Lett. 2000 Jun 12;84(24):5462-5. doi: 10.1103/PhysRevLett.84.5462.
Bragg diffraction of atoms by light waves can create high momentum components in a Bose-Einstein condensate. Collisions between atoms from two distinct momentum wave packets cause elastic scattering that can remove a significant fraction of atoms from the wave packets and cause the formation of a spherical shell of scattered atoms. We develop a slowly varying envelope technique that includes the effects of this loss on the condensate dynamics described by the Gross-Pitaevski equation. Three-dimensional numerical calculations are presented for two experimental situations: passage of a moving daughter condensate through a nonmoving parent condensate, and four-wave mixing of matter waves.
光波对原子的布拉格衍射可在玻色 - 爱因斯坦凝聚体中产生高动量分量。来自两个不同动量波包的原子之间的碰撞会导致弹性散射，这会从波包中移除相当一部分原子，并导致形成散射原子的球壳。我们开发了一种慢变包络技术，该技术考虑了这种损失对由格罗斯 - 皮塔耶夫斯基方程描述的凝聚体动力学的影响。针对两种实验情况进行了三维数值计算：移动的子凝聚体穿过静止的母凝聚体，以及物质波的四波混频。
