双层六角光晶格中冷原子的量子相变
Quantum phase transition of cold atoms in the bilayer hexagonal optical lattices
摘要：
提出了一个研究双层六角光晶格中冷原子量子相变的方案。用量子蒙特卡罗方法计算了包含反铁磁体、固体、超流体、全极化态和超固体的基态相图。我们发现在适当的参数空间中存在一个超固体，其中对角长程序与非对角长程序共存。我们证明了双层光晶格可以通过耦合两个单层光晶格来实现，并给出了在实际实验中观察这些新现象的实验方案。
英文摘要：
We propose a scheme to investigate the quantum phase transition of cold atoms in the bilayer hexagonal optical lattices. Using the quantum Monte Carlo method, we calculate the ground state phase diagrams which contain an antiferromagnet, a solid, a superfluid, a fully polarized state and a supersolid. We find there is a supersolid emerging in a proper parameter space, where the diagonal long range order coexists with off-diagonal long range order. We show that the bilayer optical lattices can be realized by coupling two monolayer optical lattices and give an experimental protocol to observe those novel phenomena in the real experiments.
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