论文标题
双层光学超级晶格中非局部耦合玻色子的Mott绝缘体阶段
Mott insulator phases of non-locally coupled bosons in bilayer optical superlattices
论文作者
论文摘要
我们通过考虑一层中的玻色子在本质上是软核，并分别允许在另一层中允许两个和三个身体硬核约束，从而研究了双层光学超级晶格中非局部耦合的骨系统的基态特性。我们发现，一层对玻色子的存在不同的限制会影响整个相图，该相图在不一致的密度下表现出各种Mott绝缘体阶段，这是由于超晶格电位的存在外，除了通常的Mott绝缘子，在密密度密度的情况下。此外，两种或三体约束的存在显着修改了莫特绝缘子 - 卵形相变点，这是超晶格电位的函数。由于各种竞争相互作用，相位图的约束和超晶格电位显示出明显不同的特征。我们使用群集 - 均视野理论方法获得完整的相图。我们进一步将这项工作扩展到耦合的两腿梯子超晶格，在那里我们使用密度矩阵重质化组方法获得了类似的物理。
We investigate the ground state properties of a non-locally coupled bosonic system in a bilayer optical superlattice by considering bosons in one layer to be of softcore in nature and separately allowing two and three body hardcore constraints on the other layer. We find that the presence of different constraints on bosons in one layer influences the overall phase diagram exhibiting various Mott insulator phases at incommensurate densities due to the presence of the superlattice potential apart from the usual Mott insulators at commensurate densities. Moreover, the presence of two or three-body constraints significantly modifies the Mott insulator-Superfluid phase transition points as a function of the superlattice potential. Due to the various competing interactions, constraints and superlattice potential the phase diagrams exhibit significantly different features. We obtain the complete phase diagrams by using the cluster-mean-field theory approach. We further extend this work to a coupled two-leg ladder superlattice where we obtain similar physics using the density matrix renormalization group method .
