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Deconfining Disordered Phase in Two-Dimensional Quantum Link Models.

Lorenzo Cardarelli1, Sebastian Greschner2, Luis Santos1

  • 1Institut für Theoretische Physik, Leibniz Universität Hannover, Appelstr. 2, DE-30167 Hannover, Germany.

Physical Review Letters
|April 14, 2020
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Summary
This summary is machine-generated.

We studied quantum link models, finding distinct phases like Neél-like and striped. A novel disordered phase exhibits deconfined properties, offering insights into spin liquids and quantum simulations.

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Area of Science:

  • Condensed Matter Physics
  • Quantum Simulation
  • Lattice Gauge Theory

Background:

  • Exploring ground-state physics of 2D spin-1/2 U(1) quantum link models.
  • These models are simple, nontrivial lattice gauge theories with fermionic matter, accessible for quantum simulations.

Purpose of the Study:

  • Investigate the ground-state phases and properties of these models.
  • Characterize transitions between different phases, particularly in the small mass limit.

Main Methods:

  • Analysis of two-dimensional spin-1/2 U(1) quantum link models.
  • Examination of Neél-like vortex-antivortex and striped crystalline phases in the large mass limit.
  • Study of a disordered phase in the small mass limit, comparing it to the Rokhsar-Kivelson point.

Main Results:

  • Observed Neél-like vortex-antivortex and striped crystalline phases for large fermion masses.
  • Identified a transition to a disordered phase for small masses, exhibiting boundary Haldane-like properties.
  • Found that striped phases are confined, while the disordered phase shows indications of being deconfined based on string tension studies.

Conclusions:

  • The disordered phase in quantum link models displays deconfined properties and resembles the quantum dimer model's Rokhsar-Kivelson point.
  • These findings open avenues for studying spin-liquid behavior and confinement-deconfinement transitions in quantum simulators without engineered plaquette terms.