Fattori M, Roati G, Deissler B, D'Errico C, Zaccanti M, Jona-Lasinio M, Santos L, Inguscio M, Modugno G
LENS and Dipartimento di Fisica, Università di Firenze, Via Nello Carrara 1, 50019 Sesto Fiorentino, Italy.
Phys Rev Lett. 2008 Nov 7;101(19):190405. doi: 10.1103/PhysRevLett.101.190405.
We study the role played by the magnetic dipole interaction in the decoherence of a lattice-based interferometer that employs an alkali Bose-Einstein condensate with a tunable scattering length. The different behavior we observe for two different orientations of the dipoles gives us evidence of the anisotropic character of the interaction. The experiment is correctly reproduced by a model we develop only if the long-range interaction between different lattice sites is taken into account. Our model indicates that dipolar interaction can be compensated by a proper choice of the scattering length and that the magnetic dipole interaction should not represent an obstacle for atom interferometry with Bose-Einstein condensates with a tunable interaction.
我们研究了磁偶极相互作用在基于晶格的干涉仪退相干过程中所起的作用，该干涉仪采用了具有可调散射长度的碱金属玻色 - 爱因斯坦凝聚体。我们观察到偶极子两种不同取向的不同行为，这为相互作用的各向异性特征提供了证据。只有考虑不同晶格位点之间的长程相互作用，我们所开发的模型才能正确再现该实验。我们的模型表明，通过适当选择散射长度可以补偿偶极相互作用，并且磁偶极相互作用不应成为使用具有可调相互作用的玻色 - 爱因斯坦凝聚体进行原子干涉测量的障碍。
