Supersolid polar molecules beyond pairwise interactions
Supersolid polar molecules beyond pairwise interactions
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DOI：
10.1103/physrevb.83.134511
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发表时间：
2011-01
影响因子：
3.7
通讯作者：
L. Bonnes;S. Wessel
中科院分区：
文献类型：
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作者：
L. Bonnes;S. Wessel
我们探索了限制在三角形几何平面光学晶格中的超冷玻色子极性分子的相图。外部静电场和微波场可用于将极性分子之间的有效相互作用调整为具有相当强度的扩展二体和三体排斥状态，从而产生丰富的量子相图。除了各种固相之外，还发现扩展的超固相持续存在于三体主导状态的深处。虽然三体相互作用明确打破了粒子-空穴对称性，但观察到了特征性的超固体-超固体量子相变，这表明半填充时粒子-空穴对称性的恢复。我们重新审视了这种填充时超固体的空间结构，考虑到具有三个不等亚晶格的进一步超固体相的存在，并提供了证据表明这种状态在有限温度下也被排除。
We explore the phase diagram of ultracold bosonic polar molecules confined to a planar optical lattice of triangular geometry. External static electric and microwave fields can be employed to tune the effective interactions between the polar molecules into a regime of extended two- and three-body repulsions of comparable strength, leading to a rich quantum phase diagram. In addition to various solid phases, an extended supersolid phase is found to persist deep into the three-body dominated regime. While three-body interactions break particle-hole symmetry explicitly, a characteristic supersolid-supersolid quantum phase transition is observed, which indicates the restoration of particle-hole symmetry at half-filling. We revisit the spatial structure of the supersolid at this filling, regarding the existence of a further supersolid phase with three inequivalent sublattices, and provide evidence that this state is excluded also at finite temperatures.