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We investigate metal-insulator transitions on an interacting two-dimensionalDirac fermion system using the determinant quantum Monte Carlo method. Theinterplay between Coulomb repulsion, disorder and magnetic fields, drives theotherwise semi-metallic regime to insulating phases exhibiting differentcharacters. In particular, with the focus on the transport mechanisms, weuncover that their combination exhibits dichotomic effects. On the one hand,the critical Zeeman field $B_c$, responsible for triggering the band-insulatingphase due to spin-polarization on the carriers, is largely reduced by thepresence of the electronic interaction and quenched disorder. On the otherhand, the insertion of a magnetic field induces a more effective localizationof the fermions, facilitating the onset of Mott or Anderson insulating phases.Yet these occur at moderate values of $B$, and cannot be explained by the fullspin-polarization of the electrons.

Inducing a metal-insulator transition in disordered interacting Dirac fermion systems via an external magnetic field