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The effect of a Zeeman magnetic field coupled to the spin of the electrons onthe conducting properties of the disordered Hubbard model is studied. Using theDeterminant Quantum Monte Carlo method, the temperature- and magnetic-field-dependent conductivity is calculated,as well as the degree of spinpolarization. We find that the Zeeman magnetic field suppresses the metallicbehavior present for certain values of interaction- and disorder- strength, andis able to induce a metal-insulator transition at a critical field strength. Itis argued that the qualitative features of magnetoconductance in thismicroscopic model containing both repulsive interactions and disorder are inagreement with experimental findings in two-dimensional electron- andhole-gases in semiconductor structures.Comment: 4 pages, 4 figure

Interacting Electrons in a Two-Dimensional Disordered Environment: Effect of a Zeeman Magnetic Field