Bermúdez Carballo, AlejandroMartín-Delgado Alcántara, Miguel ÁngelLuis Aina, Alfredo2023-06-202023-06-202008-06-111050-294710.1103/PhysRevA.77.063815https://hdl.handle.net/20.500.14352/51471©2008 The American Physical Society. We acknowledge financial support from Spanish MEC Project No. FIS2006-04885, Project No. CAM-UCM/910758 A.B. and M.A.M.D. and UCM Project No. PR1-A/07-15378 A.L. Additionally, we acknowledge support from a FPU MEC grant A.B., and ESF Science Programme No. INSTANS 2005–2010 M.A.M.D.We study a relativistic spin-1/2 fermion subjected to a Dirac oscillator coupling and a constant magnetic field. An interplay between opposed chirality interactions culminates in the appearance of a relativistic quantum phase transition, which can be fully characterized. We obtain analytical expressions for the energy gap, order parameter, and canonical quantum fluctuations across the critical point. Moreover, we also discuss the effect of this phase transition on the statistics of the chiral bosonic ensemble, where its super-or sub-Poissonian nature can be controlled by means of external parameters. Finally, we study the entanglement properties between the degrees of freedom in the relativistic ground state, where an interesting transition between a biseparable and a genuinely tripartite entangled state occurs.engjournal articlehttp://dx.doi.org/10.1103/PhysRevA.77.063815http://journals.aps.org/open access535Su(11) coherent statesNonclassical propertiesEntanglementDynamicsIonsÓptica (Física)2209.19 Óptica Física