Dual-fermion approach to the Anderson-Hubbard model
Abstract
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.
- Publication:
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Physical Review B
- Pub Date:
- January 2017
- DOI:
- 10.1103/PhysRevB.95.045130
- arXiv:
- arXiv:1604.08138
- Bibcode:
- 2017PhRvB..95d5130H
- Keywords:
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- Condensed Matter - Strongly Correlated Electrons
- E-Print:
- Phys. Rev. B 95, 045130 (2017)