Günther A, Kraft S, Zimmermann C, Fortágh J
Physikalisches Institut der Universität Tübingen, Auf der Morgenstelle 14, 72076 Tübingen, Germany.
Phys Rev Lett. 2007 Apr 6;98(14):140403. doi: 10.1103/PhysRevLett.98.140403.
We report the phase coherent splitting of Bose-Einstein condensates by means of a phase grating produced near the surface of a microelectronic chip. A lattice potential with a period of 4 mum is generated by the superposition of static and oscillating magnetic fields. Precise control of the diffraction is achieved by controlling the currents in the integrated conductors. The interference of overlapping diffraction orders is observed after 8 ms of propagation in a harmonic trap and subsequent ballistic expansion of the atomic ensemble. By analyzing the interference pattern we show a reproducible phase relation between the diffraction orders with an uncertainty limited by the resolution of the diffraction grating.
我们报告了通过在微电子芯片表面附近产生的相位光栅对玻色-爱因斯坦凝聚体进行相位相干分裂的情况。通过静态磁场和振荡磁场的叠加产生了周期为4微米的晶格势。通过控制集成导体中的电流实现了对衍射的精确控制。在谐波阱中传播8毫秒并随后对原子系综进行弹道膨胀后，观察到了重叠衍射级的干涉。通过分析干涉图样，我们展示了衍射级之间可重复的相位关系，其不确定性受衍射光栅分辨率的限制。
