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arXiv 1101.0913cond-mat.quant-gas
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超固态极性分子超越两两相互作用

Supersolid Polar Molecules beyond Pairwise Interactions

Lars Bonnes, Stefan Wessel

摘要:

本文研究了超冷玻色子极性分子在三角形平面光晶格中的相图。外部静电场和微波场可以用来调整极性分子之间的有效相互作用,使其成为一种强度相当的扩展的两体和三体排斥,从而产生丰富的量子相图。除了各种固相,一个扩展的超固相被发现坚持深入到三体为主的政权。当三体相互作用明确地破坏粒子-空穴对称性时,观察到特征的超固态-超固态量子相变,这表明在半填充时粒子-空穴对称性的恢复。我们重新审视在这种填充的超固体的空间结构,关于存在一个进一步的超固相与三个不等价的子晶格,并提供证据表明,这种状态也被排除在有限的温度。

英文摘要:

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.

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