Peculiar supersolid phases induced by frustrated tunneling in the extended Bose-Hubbard model
Peculiar supersolid phases induced by frustrated tunneling in the extended Bose-Hubbard model
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扩展 Bose-Hubbard 模型中受挫隧道效应引起的特殊超固相
DOI：
10.1103/physrevb.96.045119
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发表时间：
2017
影响因子：
3.7
通讯作者：
Lixin He
中科院分区：
文献类型：
--
作者：
Shao-Jun Dong;Wenyuan Liu;Xiang-Fa Zhou;Guang-Can Guo;Zheng-Wei Zhou;Yong-Jian Han;Lixin He
利用最先进的张量网络状态方法，研究了具有挫折次近邻隧道作用的方形晶格上扩展玻色-哈伯德模型的基态相图。在硬核极限下，隧道破坏稳定了一种特殊的半超固相，其中一个亚晶格是超流体，另一个亚晶格是远离半填充的莫特绝缘子。在软岩心情况下，模型显示了半填充以上非常丰富的相图，包括三种不同类型的超固相，这取决于相互作用参数。所考虑的模型为在偶极原子或分子半填充下的区域中实验寻找由受挫隧道诱导的新型稳定超固态提供了一条有希望的途径。
By using a state-of-the-art tensor network state method, we study the ground-state phase diagram of an extended Bose-Hubbard model on the square lattice with frustrated next-nearest-neighbor tunneling. In the hard-core limit, tunneling frustration stabilizes a peculiar half-supersolid phase with one sublattice being superfluid and the other sublattice being Mott insulator away from half filling. In the soft-core case, the model shows very rich phase diagrams above half filling, including three different types of supersolid phases depending on the interaction parameters. The considered model provides a promising route to experimentally search for a novel stable supersolid state induced by frustrated tunneling in the region below half filling with dipolar atoms or molecules.