Midlands Ultracold Atom Research Centre, School of Physics and Astronomy, The University of Nottingham, United Kingdom.
Phys Rev Lett. 2011 Aug 5;107(6):060406. doi: 10.1103/PhysRevLett.107.060406. Epub 2011 Aug 4.
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.
我们研究了一种二维原子格子气体，这些原子被光激发到里德堡态，在里德堡态中它们通过范德瓦尔斯相互作用相互作用。我们探索了主导近邻相互作用的区域，在这个区域中，这个系统与巴克斯特硬方模型的量子版本密切相关。我们表明，里德堡气体的强关联基态可以通过投影纠缠对态进行解析描述，该态构成了量子硬方模型的基态。这种对应关系使我们能够确定一个相界，在这个相界中，里德堡气体从无序（液体）相转变为有序（固体）相。
