Effect of interactions, disorder and magnetic field in the Hubbard model in two dimensions |
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| Authors: | N Trivedi P J H Denteneer D Heidarian R T Scalettar |
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| Institution: | (1) Department of Theoretical Physics, Tata Institute of Fundamental Research, Homi Bhabha Road, Colaba, 400 005 Mumbai, India;(2) Department of Physics, The Ohio State University, Columbus, OH, USA;(3) Lorentz Institute, Leiden University, Leiden, The Netherlands;(4) Department of Physics, University of California at Davis, Davis, CA, USA |
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| Abstract: | The effects of both interactions and Zeeman magnetic field in disordered electronic systems are explored in the Hubbard model
on a square lattice. We investigate the thermodynamic (density, magnetization, density of states) and transport (conductivity)
properties using determinantal quantum Monte Carlo and inhomogeneous Hartree Fock techniques. We find that at half filling
there is a novel metallic phase at intermediate disorder that is sandwiched between a Mott insulator and an Anderson insulator.
The metallic phase is highly inhomogeneous and coexists with antiferromagnetic long-range order. At quarter filling also the
combined effects of disorder and interactions produce a conducting state which can be destroyed by applying a Zeeman field,
resulting in a magnetic field-driven transition. We discuss the implication of our results for experiments. |
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| Keywords: | Metal-insulator transition correlations disorder |
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