Phys. Rev. Lett. 90, 246401 (2003) [4 pages]Interacting Electrons in a Two-Dimensional Disordered Environment: Effect of a Zeeman Magnetic FieldReceived 27 February 2003; published 17 June 2003 The effect of a Zeeman magnetic field coupled to the spin of the electrons on the conducting properties of the disordered Hubbard model is studied. Using the determinant quantum Monte Carlo method, the temperature- and magnetic-field-dependent conductivity is calculated, as well as the degree of spin polarization. We find that the Zeeman magnetic field suppresses the metallic behavior present for certain values of interaction and disorder strength and is able to induce a metal-insulator transition at a critical field strength. It is argued that the qualitative features of magnetoconductance in this microscopic model containing both repulsive interactions and disorder are in agreement with experimental findings in two-dimensional electron and hole gases in semiconductor structures. © 2003 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.90.246401
DOI:
10.1103/PhysRevLett.90.246401
PACS:
71.10.Fd, 71.30.+h, 72.15.Rn
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