1. A correlated Anderson insulator on the honeycomb lattice
- Author
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Ma, Tianxing, Zhang, Lufeng, Chang, Chia-Chen, Hung, Hsiang-Hsuan, and Scalettar, Richard T.
- Subjects
Condensed Matter - Strongly Correlated Electrons ,Condensed Matter - Disordered Systems and Neural Networks - Abstract
We study the effect of disorder on the semimetal -- Mott insulator transition in the half-filled repulsive Hubbard model on a honeycomb lattice, a system that features vanishing density of states at the Fermi level. Using the determinant quantum Monte Carlo method, we characterize various phases in terms of the bulk-limit antiferromagnetic (AF) order parameter, compressibility, and temperature-dependent DC conductivity. In the clean limit, our data are consistent with previous results showing a single quantum critical point separating the semi-metallic and AF Mott insulating phases. With the presence of randomness, a non-magnetic disordered insulating phase emerges. Inside this disordered insulator phase, there is a crossover from a gapless Anderson-like insulator to a gapped Mott-like insulator., Comment: 5 pages, 5 figures
- Published
- 2016
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