Spin-3 dynamics study in a chromium Bose-Einstein Condensate

O. Gorceix, B. Pasquiou, G. Bismut, E. Maréchal, P. Pedri, L. Vernac, B. Laburthe-Tolra
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Abstract

Dipole-dipole interactions are long-ranged and anisotropic. They induce a coupling between spin and angular momentum degrees of freedom yielding new interesting physics in the field of dilute quantum gases. We have thoroughly studied dipolar relaxation DR processes in a chromium BEC transferred into an excited magnetic m = +3 sublevel and loaded in 1D and 2D optical lattices [1, 2, 3]. We demonstrate and quantify how the confinement of a quantum gas in optical lattices deeply modifies the DR processes. In particular, we show that DR is strongly inhibited at low magnetic fields when the released energy becomes smaller than the vibrational quantum of energy at the bottom of the lattice wells. We show that interband transitions are induced above the corresponding threshold and that metastability of the “excited state BEC” is reached below the 2D threshold [1].
铬玻色-爱因斯坦凝聚体中自旋-3动力学研究
偶极-偶极相互作用是长程和各向异性的。它们诱导了自旋和角动量自由度之间的耦合,在稀量子气体领域产生了新的有趣的物理学。我们已经深入研究了铬BEC转移到激发磁m = +3亚能级并加载在1D和2D光学晶格中的偶极弛豫DR过程[1,2,3]。我们证明并量化了量子气体在光学晶格中的约束如何深刻地改变了DR过程。特别是,当释放的能量小于晶格阱底部能量的振动量子时,DR在低磁场下被强烈抑制。我们发现在相应的阈值以上会诱发带间跃迁,而“激发态BEC”在二维阈值以下达到亚稳态[1]。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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