Mass imbalance in the ionic Hubbard model: a DRMG study

• URL: http://arxiv.org/abs/2109.08716v1
• Date: Fri, 17 Sep 2021 18:48:11 GMT
• Title: Mass imbalance in the ionic Hubbard model: a DRMG study
• Authors: D. C. Padilla-Gonz\'alez, R. Franco, J. Silva-Valencia
• Abstract summary: We investigate the ionic Hubbard model with mass imbalance in one dimension. This model exhibits a band insulator phase and an antiferromagnetic one, both with a finite spin gap. We found that this quantum phase transition is continuous, unalike the previous mean-field theory result.
• Score: 0.0
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: We investigated the ionic Hubbard model with mass imbalance in one dimension, using the density matrix renormalization group method. This model exhibits a band insulator phase and an antiferromagnetic one, both with a finite spin gap. We found that this quantum phase transition is continuous, unalike the previous mean-field theory result. The von Neumann block entropy is maximum at the critical points, a fact that we used to build the phase diagram.

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