Phase-diagram and quasiparticles of a lattice SU(2)
نویسندگان
چکیده
Phase-diagram and quasiparticles of a lattice SU(2) scalar-fermion model in (2+1) dimensions. 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 adaptate 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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تاریخ انتشار 2008