Auxiliary dynamical mean-field approach for Anderson-Hubbard model with off-diagonal disorder
- URL: http://arxiv.org/abs/2502.07353v1
- Date: Tue, 11 Feb 2025 08:24:43 GMT
- Title: Auxiliary dynamical mean-field approach for Anderson-Hubbard model with off-diagonal disorder
- Authors: Zelei Zhang, Jiawei Yan, Li Huang, Youqi Ke,
- Abstract summary: We study strongly correlated and disordered electronic systems with both diagonal and off-diagonal disorders.<n>Our results reveal the critical influence of off-diagonal disorder on Mott-type metal-insulator transitions.
- Score: 4.052573140142517
- License: http://creativecommons.org/licenses/by-nc-nd/4.0/
- Abstract: This work reports a theoretical framework that combines the auxiliary coherent potential approximation (ACPA-DMFT) with dynamical mean-field theory to study strongly correlated and disordered electronic systems with both diagonal and off-diagonal disorders. In this method, by introducing an auxiliary coupling space with extended local degree of freedom,the diagonal and off-diagonal disorders are treated in a unified and self-consistent framework of coherent potential approximation, within which the dynamical mean-field theory is naturally combined to handle the strongly correlated Anderson-Hubbard model. By using this approach, we compute matsubara Green's functions for a simple cubic lattice at finite temperatures and derive impurity spectral functions through the maximum entropy method. Our results reveal the critical influence of off-diagonal disorder on Mott-type metal-insulator transitions. Specifically, a reentrant phenomenon is identified, where the system transitions between insulating and metallic states under varying interaction strengths. The ACPA-DMFT method provides an efficient and robust computational method for exploring the intricate interplay of disorder and strong correlations.
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