Effect of interactions, disorder and magnetic field in the Hubbard model in two dimensions

Pramana

P J H Denteneer²  D Heidarian³  R T Scaletar¹  N Trivedi1 2³ 

[1] Department of Physics, University of California at Davis, Davis, CA, USA$$;Lorentz Institute, Leiden University, Leiden, The Netherlands$$;Department of Theoretical Physics, Tata Institute of Fundamental Research, Homi Bhabha Road, Colaba, Mumbai 400 005, India$$

关键词: Metal–insulator transition;    correlations;    disorder.;   

DOI  :  

学科分类：物理（综合）

来源: Indian Academy of Sciences

【 摘 要 】

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.

【 授权许可】

Unknown