Article Synopsis
- The study investigates the ground-state physics of 2D spin-1/2 U(1) quantum link models, focusing on how these models can be used for quantum simulations with fermionic matter.
- In the large mass limit, researchers observe Neél-like vortex-antivortex and striped crystalline phases, but for smaller masses, they find a transition to a disordered phase similar to the Rokhsar-Kivelson point in quantum dimer models.
- The research indicates that while striped phases show confinement of gauge charges, the novel disordered phase exhibits signs of being deconfined, suggesting new potential for studying complex behaviors like spin-liquid states and phase transitions in quantum simulators.
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Article Abstract
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.
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| http://dx.doi.org/10.1103/PhysRevLett.124.123601 | DOI Listing |
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