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Two-dimensional Rydberg gases and the quantum hard squares model

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arxiv 1104.3080 v2 pith:3YKLMS6M submitted 2011-04-15 physics.atom-ph cond-mat.quant-gas

Two-dimensional Rydberg gases and the quantum hard squares model

classification physics.atom-ph cond-mat.quant-gas
keywords rydberghardmodelphasequantumsquaresstateground
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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We study a two-dimensional lattice gas of atoms that are photo-excited to high-lying 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 to 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 first order phase boundary where the Rydberg gas undergoes a transition from a disordered (liquid) phase to an ordered (solid) phase.

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