三次和五次非线性光晶格中玻色-爱因斯坦凝聚体的超流性损失
Loss of superfluidity in the Bose-Einstein condensate in an optical lattice with cubic and quintic nonlinearity
摘要：
在一维浅光晶格中，在同时存在三阶和五阶非线性的情况下，在玻色-爱因斯坦凝聚体中发现了超流密度波。有趣的是，当这些相互作用中只有一个起作用时，它就不复存在了。我们预测通过一个经典的动力学相变，调制不稳定性导致的相位相干性损失的超流性的损失。在一定的参数范围内，晶格势和相互作用之间的竞争被证明会产生条纹相，其中原子被限制在有限的区域内。在纯二体情况下，除了已知的超流和绝缘相，密度波绝缘相被发现存在，拥有两个频率调制相称的晶格势。
英文摘要：
In a one-dimensional shallow optical lattice, in the presence of both cubic and quintic nonlinearity, a superfluid density wave is identified in a Bose-Einstein condensate. Interestingly, it ceases to exist when only one of these interactions is operative. We predict the loss of superfluidity through a classical dynamical phase transition, where modulational instability leads to the loss of phase coherence. In a certain parameter domain, the competition between lattice potential and the interactions is shown to give rise to a stripe phase, where atoms are confined in finite domains. In a pure two-body case, apart from the known superfluid and insulating phases, a density wave insulating phase is found to exist, possessing two frequency modulations commensurate with the lattice potential.
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