Transport criticality in triangular lattice Hubbard model

Abstract

We study electric transport near the Mott metal-insulator transition. Optical conductivity of the half-filled Hubbard model on a triangular lattice is calculated based on a cellular dynamical mean field theory including vertex corrections inside the cluster. By investigating the spectrum at low frequencies, we find that a Drude peak on the metallic side smoothly connects to an "ingap" peak on the insulating side. The optical weight of these peaks exhibits a critical behavior with power-law near the Mott critical end point, $|D-D^{\ast }|\propto |U-U^{\ast }{|}^{1/\delta }$. We find that the critical exponent $1/\delta$ differs from the exponents in the thermodynamics.

4 pages, 4 figures

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Cited by in corpus (4)

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• Transport and spectroscopic signatures of a disorder-stabilized metal in two-dimensional frustrated Mott insulators