Dual-fermion approach to the Anderson-Hubbard model

Article

关键词: OFF-DIAGONAL DISORDER;    COHERENT-POTENTIAL APPROXIMATION;    RANDOM SUBSTITUTIONAL ALLOYS;    CORRELATED ELECTRON-SYSTEMS;    QUANTUM IMPURITY MODELS;    MONTE-CARLO;    INFINITE DIMENSIONS;    MOTT TRANSITION;    LATTICE;    ABSENCE;   

DOI  :  10.1103/PhysRevB.95.045130

来源: SCIE

【 摘 要 】

We apply the recently developed dual-fermion algorithm for disordered interacting systems to the Anderson-Hubbard model. This algorithm is compared with dynamical cluster approximation calculations for a one-dimensional system to establish the quality of the approximation in comparison with an established cluster method. We continue with a three-dimensional (3D) system and look at the antiferromagnetic, Mott, and Anderson localization transitions. The dual-fermion approach leads to quantitative as well as qualitative improvement of the dynamical mean-field results, and it allows one to calculate the hysteresis in the double occupancy in 3D, taking into account nonlocal correlations.

【 授权许可】

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