Insulator-metal-insulator transition and selective spectral weight transfer in a disordered strongly correlated system

Abstract

We investigate the metal insulator transitions at finite temperature for the Hubbard model with diagonal alloy disorder. We solve the dynamical mean field theory equations with the non crossing approximation and we use the coherent potential approximation to handle disorder. The excitation spectrum is given for various correlation strength $U$ and disorder. Two successive metal insulator transitions are observed at integer filling values as $U$ is increased. An important selective transfer of spectral weight arises upon doping. The strong influence of the temperature on the low energy dynamics is studied in details.

arXiv commentsubmitted to Phys. Rev. B

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• Mott and Band Insulator Transitions in the Binary Alloy Hubbard Model
• Dynamical mean-field theory of the Anderson-Hubbard model with local and non-local disorder in tensor formulation
• Finite-temperature phase transitions in the ionic Hubbard model
• Analysis of the Disorder-Induced Zero Bias Anomaly in the Anderson-Hubbard Model
• Phase transitions in the binary-alloy Hubbard model: insight from strong-coupling perturbation theory
• Coherent cellular dynamical mean-field theory: a real-space quantum embedding approach to disorder in strongly correlated electron systems
• Dynamical Cluster Approximation Study of Electron Localization in the Extended Hubbard Model