Leanhardt A E, Shin Y, Chikkatur A P, Kielpinski D, Ketterle W, Pritchard D E
Department of Physics, MIT-Harvard Center for Ultracold Atoms, and Research Laboratory of Electronics, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA.
Phys Rev Lett. 2003 Mar 14;90(10):100404. doi: 10.1103/PhysRevLett.90.100404. Epub 2003 Mar 12.
Magnetically and optically confined Bose-Einstein condensates were studied near a microfabricated surface. Condensate fragmentation observed in microfabricated magnetic traps was not observed in optical dipole traps at the same location. The measured condensate lifetime was >or=20 s and independent of the atom-surface separation under both magnetic and optical confinement. Radio-frequency spin-flip transitions driven by technical noise were directly observed for optically confined condensates and could limit the condensate lifetime in microfabricated magnetic traps.
在微纳加工表面附近对磁约束和光约束玻色-爱因斯坦凝聚体进行了研究。在微纳加工磁阱中观察到的凝聚体碎裂现象，在同一位置的光偶极阱中并未观察到。测量得到的凝聚体寿命大于或等于20秒，并且在磁约束和光约束条件下均与原子-表面间距无关。对于光约束凝聚体，直接观测到了由技术噪声驱动的射频自旋翻转跃迁，这可能会限制微纳加工磁阱中凝聚体的寿命。
