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Published on: March 24, 2019
Interacting electrons in a two-dimensional disordered environment: effect of a zeeman magnetic field
P J H Denteneer1, R T Scalettar
1Lorentz Institute, Leiden University, PO Box 9506, 2300 RA Leiden, The Netherlands.
Abstract:
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.
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