Quantum phases in tunable state-dependent hexagonal optical lattices
Quantum phases in tunable state-dependent hexagonal optical lattices
复制标题
DOI：
10.1103/physreva.90.013614
复制
发表时间：
2014-01
影响因子：
2.9
通讯作者：
Dirk-Soren Luhmann;O. Jurgensen;Malte Weinberg;J. Simonet;P. Soltan-Panahi;K. Sengstock
中科院分区：
文献类型：
--
作者：
Dirk-Soren Luhmann;O. Jurgensen;Malte Weinberg;J. Simonet;P. Soltan-Panahi;K. Sengstock
我们研究了在状态依赖的类石墨烯蜂窝光学晶格中超冷玻色子原子的基态性质，其中两个三角形亚晶格a和B之间的简并可以被解除。我们讨论了用这种晶格设置可以获得的各种几何形状，并提出了一种利用外部磁场控制能量偏移的方案。现场相互作用与偏移能量的竞争导致了以亚晶格间种群不平衡为特征的莫特相。对于最优哈伯德模型的定义，我们展示了一个方案，允许有效的计算万尼尔函数。使用聚类平均场方法，我们计算了相图，并提供了任意能量偏移的通用表示。我们发现超流体到莫特绝缘子的转变与实验数据吻合得很好。
We study the ground-state properties of ultracold bosonic atoms in a state-dependent graphenelike honeycomb optical lattice, where the degeneracy between the two triangular sublattices A and B can be lifted. We discuss the various geometries accessible with this lattice setup and present a scheme to control the energy offset with external magnetic fields. The competition of the on-site interaction with the offset energy leads to Mott phases characterized by population imbalances between the sublattices. For the definition of an optimal Hubbard model, we demonstrate a scheme that allows for the efficient computation of Wannier functions. Using a cluster mean-field method, we compute the phase diagrams and provide a universal representation for arbitrary energy offsets. We find good agreement with the experimental data for the superfluid to Mott insulator transition.