Ground states of a mixture of two species of spinor Bose gases with interspecies spin exchange
Ground states of a mixture of two species of spinor Bose gases with interspecies spin exchange
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DOI：
10.1103/physreva.82.023603
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发表时间：
2009-12
影响因子：
2.9
通讯作者：
Yu Shi
中科院分区：
文献类型：
--
作者：
Yu Shi
我们考虑两种具有种间自旋交换的自旋1原子的混合物，这种自旋交换可能与种内自旋交换合作或竞争，从而极大地影响基态。它代表了一种不同于单种旋量气体的新型玻色子气体。我们在几个参数体系中确定了精确的基态，并利用本文推广的适用于两种旋量气体混合物的生成函数方法研究了复合结构。最有趣的阶段是所谓的纠缠玻色-爱因斯坦凝聚（BEC），这是两个物种之间以及种间和种内单重态对之间量子纠缠的碎片BEC。为了进行比较，我们还将生成函数方法应用于两种伪自旋-(1/2)原子的混合物，其中每种原子的总自旋量子数固定为原子数的一半，而自旋1的情况则是由能量学决定的变量。因此，在赝自旋-(1/2)混合物的纠缠态BEC中，单重态对都是种间的。种间自旋交换导致了超越单一原子的旋量BEC的新特征，以及没有种间自旋交换的混合物。
We consider a mixture of two species of spin-1 atoms with interspecies spin exchange, which may cooperate or compete with intraspecies spin exchanges and thus dramatically affect the ground state. It represents a new class of bosonic gases differing from single-species spinor gases. We determine the exact ground states in several parameter regimes and study the composite structures using the generating function method generalized here to be applicable to a mixture of two species of spinor gases. The most interesting phase is the so-called entangled Bose-Einstein condensation (BEC), which is fragmented BEC with quantum entanglement between the two species and with both interspecies and intraspecies singlet pairs. For comparison, we also apply the generating function method to a mixture of two species of pseudospin-(1/2) atoms, for which the total spin quantum number of each species is fixed as half of the atom number, in contrast with the case of spin 1, for which it is a variable determined by energetics. Consequently, singlet pairs in entangled BEC of a pseudospin-(1/2) mixture are all interspecies. Interspecies spin exchange leads to novel features beyond those of spinor BEC of a single species of atoms as well as mixtures without interspecies spin exchange.