Optical Conductivity of the two dimensional Hubbard model: vertex corrections, emergent Galilean invariance and the accuracy of the single-site dynamical mean field approximation

Abstract

We compute the frequency dependent conductivity of the two dimensional square lattice Hubbard model at zero temperature as a function of density to second order in the interaction strength, and compare the results to the predictions of single-site dynamical mean field theory computed at the same order. We find that despite the neglect of vertex corrections, the single site dynamical mean field approximation produces semiquantitatively accurate results for most carrier concentrations, but fails qualitatively for the nearly empty or nearly filled band cases where the theory exhibits an emergent Galilean invariance. The theory also becomes qualitatively inaccurate very near half filling if nesting is important.

12 pages, 6 figures

References in corpus (6)

• Plane-wave based electronic structure calculations for correlated materials using dynamical mean-field theory and projected local orbitals
• Momentum space anisotropy and pseudogaps: a comparative cluster dynamical mean field analysis of the doping-driven metal-insulator transition in the two dimensional Hubbard model
• Mott insulating states with competing orders in the triangular lattice Hubbard model
• Charge transport in the Hubbard model at high temperatures: triangular versus square lattice
• Optical conductivity near finite-wavelength quantum criticality
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