光晶格诱导玻色子原子的关联跳跃
Correlated hopping of bosonic atoms induced by optical lattices
摘要：
在这项工作中，我们分析了一个特殊的设置与超冷原子被困在状态相关的晶格。我们表明，任何接触相互作用的不对称转化为两类相关跳跃。在导出原子的有效晶格哈密顿量后，我们用解析和数值方法得到了不同的相位和量子相变。我们发现，对于弱关联跳跃的莫特绝缘体和电荷密度波，而较强的关联跳跃的系统过渡到一对超流体。我们证明，这一阶段存在广泛的相互作用不对称性，并有有趣的相关特性，区分它从一个普通的原子玻色-爱因斯坦凝聚体。
英文摘要：
In this work we analyze a particular setup with ultracold atoms trapped in state-dependent lattices. We show that any asymmetry in the contact interaction translates into one of two classes of correlated hopping. After deriving the effective lattice Hamiltonian for the atoms, we obtain analytically and numerically the different phases and quantum phase transitions. We find for weak correlated hopping both Mott insulators and charge density waves, while for stronger correlated hopping the system transitions into a pair superfluid. We demonstrate that this phase exists for a wide range of interaction asymmetries and has interesting correlation properties that differentiate it from an ordinary atomic Bose-Einstein condensate.
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