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Deconfining Disordered Phase in Two-Dimensional Quantum Link Models
Physical Review Letters ( IF 8.6 ) Pub Date : 2020-03-23 , DOI: 10.1103/physrevlett.124.123601
Lorenzo Cardarelli , Sebastian Greschner , Luis Santos

We explore the ground-state physics of two-dimensional spin-1/2 U(1) quantum link models, one of the simplest nontrivial lattice gauge theories with fermionic matter within experimental reach for quantum simulations. Whereas in the large mass limit we observe Neél-like vortex-antivortex and striped crystalline phases, for small masses there is a transition from the striped phases into a disordered phase whose properties resemble those at the Rokhsar-Kivelson point of the quantum dimer model. This phase is characterized on ladders by boundary Haldane-like properties, such as vanishing parity and finite string ordering. Moreover, from studies of the string tension between gauge charges, we find that, whereas the striped phases are confined, the novel disordered phase present clear indications of being deconfined. Our results open exciting perspectives of studying highly nontrivial physics in quantum simulators, such as spin-liquid behavior and confinement-deconfinement transitions, without the need of explicitly engineering plaquette terms.

中文翻译:

在二维量子链路模型中解禁无序相位

我们探索二维自旋的基态物理学1个/2U(1)量子链接模型,最简单的非平凡晶格规理论之一,在量子模拟的实验范围内具有铁离子物质。在较大的质量限制范围内,我们观察到类似Neél的涡旋-反涡旋和条纹状结晶相,而对于小质量块,则存在从条纹状相到无序相的过渡,无序相的性质类似于量子二聚体模型的Rokhsar-Kivelson点的性质。此阶段在梯子上具有类似于Haldane的边界特性,例如消失的奇偶校验和有限的字符串排序。此外,从对规范电荷之间的弦张力的研究中,我们发现,虽然条带状相是受限的,但新型无序相却表现出明显的局限性。我们的结果为在量子模拟器中研究高度非平凡的物理学开辟了令人兴奋的观点,
更新日期:2020-03-24
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