Two-dimensional Rydberg gases and the quantum hard-squares model.
Two-dimensional Rydberg gases and the quantum hard-squares model.
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DOI：
10.1103/physrevlett.107.060406
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发表时间：
2011-04
影响因子：
8.6
通讯作者：
S. Ji;C. Ates;I. Lesanovsky
中科院分区：
文献类型：
--
作者：
S. Ji;C. Ates;I. Lesanovsky
我们研究了原子的二维晶格气体，这些原子被光激发到里德堡态，其中它们通过范德华相互作用相互作用。我们探索了占主导地位的最近邻相互作用的机制，其中该系统与巴克斯特硬平方模型的量子版本密切相关。我们表明，里德堡气体的强相关基态可以通过构成量子硬方块模型基态的投影纠缠对态来分析描述。这种对应关系使我们能够识别里德伯气体经历从无序（液相）相到有序（固相）相转变的相界。
We study a two-dimensional lattice gas of atoms that are photoexcited to Rydberg states in which they interact via the van der Waals interaction. We explore the regime of dominant nearest-neighbor interaction where this system is intimately connected with a quantum version of Baxter's hard-squares model. We show that the strongly correlated ground state of the Rydberg gas can be analytically described by a projected entangled pair state that constitutes the ground state of the quantum hard-squares model. This correspondence allows us to identify a phase boundary where the Rydberg gas undergoes a transition from a disordered (liquid) phase to an ordered (solid) phase.