2026-06-27T13:59:13Zhttps://docta.ucm.es/rest/oai/request

oai:docta.ucm.es:20.500.14352/603262023-08-27T19:07:29Zcom_20.500.14352_14col_20.500.14352_15

Alonso, J.L. Boucaud, Ph. Martín Mayor, Víctor van der Sijs, A.J. 2023-06-20T20:28:23Z 2023-06-20T20:28:23Z 2000-02-01 0556-2821 10.1103/PhysRevD.61.034501 https://hdl.handle.net/20.500.14352/60326 http://dx.doi.org/10.1103/physrevd.61.034501 https://journals.aps.org 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. eng open access Phase diagram and quasiparticles of a lattice SU(2) scalar-fermion model in 2+1 dimensions journal article