Breakdown of Landau Theory in Overdoped Cuprates near the Onset of Superconductivity

TL;DR

This paper uses the functional renormalization group to analyze how quasi-particle scattering rates in overdoped cuprates deviate from Landau Fermi liquid behavior near superconductivity onset, matching recent experimental findings.

Contribution

It demonstrates the breakdown of Landau Fermi liquid theory in overdoped cuprates using a detailed renormalization group analysis of the Hubbard model.

Findings

Angle-dependent linear temperature scattering term identified

Behavior consistent with experimental observations

Confirms breakdown of Landau Fermi liquid near superconductivity

Abstract

We use the functional renormalization group to analyze the temperature dependence of the quasi-particle scattering rates in the two-dimensional Hubbard model below half-filling. Using a band structure appropriate to overdoped Tl2Ba2CuO(6+x) we find a strongly angle dependent term linearly dependent on temperature which derives from an increasing scattering vertex as the energy scale is lowered. This behavior agrees with recent experiments and confirms earlier conclusions on the origin of the breakdown of the Landau Fermi liquid near the onset of superconductivity.