Phase diagram and quasiparticles of a lattice SU(2) scalar-fermion model in 2+1 dimensions

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ID: 268241
1999
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Abstract
The phase diagram at zero temperature of a lattice SU(2) scalar-fermion model in 2+1 dimensions is studied numerically and with mean-field methods. Special attention is devoted to the strong coupling regime. We have developed a new method to adapt the hybrid Monte Carlo algorithm to the O(3) non-linear $\ensuremath{\sigma}$ model constraint. The charged excitations in the various phases are studied at the mean-field level. Bound states of two charged fermions are found in a strongly coupled paramagnetic phase. On the other hand, in the strongly coupled antiferromagnetic phase fermionic excitations around momenta $(\ifmmode\pm\else\textpm\fi{}\ensuremath{\pi}/2,\ifmmode\pm\else\textpm\fi{}\ensuremath{\pi}/2,\ifmmode\pm\else\textpm\fi{}\ensuremath{\pi}/2)$ emerge.
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alonso1999physicalphase Use this key to autocite in the manuscript while using SciMatic Manuscript Manager or Thesis Manager
Authors J. L. Alonso;Ph. Boucaud;V. Martín-Mayor;A. J. van der Sijs;
Journal physical review d
Year 1999
DOI
doi:10.1103/PhysRevD.61.034501
URL
https://doi.org/10.1103/physrevd.61.034501
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