%0 Journal Article
%A Alonso, J.L.
%A Boucaud, Ph.
%A Martín Mayor, Víctor
%A van der Sijs, A.J.
%T Phase diagram and quasiparticles of a lattice SU(2) scalar-fermion model in 2+1 dimensions
%D 2000
%@ 0556-2821
%U https://hdl.handle.net/20.500.14352/60326
%X The phase diagram at zero temperature of a lattice SU(2) scalar-fermion model in 211 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 σ 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 (±π/2, ±π/2, ±π/2) emerge.
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