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Magnetic monopole plasma phase in (2+1)d compact quantum electrodynamics with fermionic matter

DOI: 10.1103/PhysRevD.84.014502 DOI Help

Authors: Wes Armour (Diamond Light Source) , Simon Hands (University of Wales, Swansea) , John B. Kogut (Department of Energy, Division of High Energy Physics; University of Maryland) , Biagio Lucini (Swansea University) , Costas Strouthos (University of Cyprus) , Pavios Vranas (Lawrence Livermore National Laboratory)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: Physical Review D , VOL 84 (1)

State: Published (Approved)
Published: July 2011

Abstract: We present the first evidence from lattice simulations that the magnetic monopoles in three-dimensional compact quantum electrodynamics (cQED3) with Nf ¼ 2 and Nf ¼ 4 four-component fermion flavors are in a plasma phase. The evidence is based mainly on the divergence of the monopole susceptibility (polarizability) with the lattice size at weak gauge couplings. Aweak four-Fermi term added to the cQED3 action enabled simulations with massless fermions. The exact chiral symmetry of the interaction terms forbids symmetry breaking lattice discretization counterterms to appear in the theory’s effective action. It is also shown that the scenario of a monopole plasma does not depend on the strength of the four-Fermi coupling. Other observables such as the densities of isolated dipoles and monopoles and the so-called specific heat show that a crossover from a dense monopole plasma to a dilute monopole gas occurs at strong couplings. The implications of our results on the stability of Uð1Þ spin liquids in two spatial d mensions are also discussed.

Journal Keywords: Chiral Symmetry; Computerized Simulation; Coupling; Dipoles; Fermions; Flavor Model; Interactions; Lattice Field Theory; Magnetic Monopoles; Plasma; Polarizability; Quantum Electrodynamics; Specific Heat; Spin; Stability; Symmetry Breaking; Three-Dimensional Calculations; U-1 Groups

Subject Areas: Physics

Technical Areas: