Doping dependence of charge dynamics in electron-doped cuprates

TL;DR

This study uses the t-t'-J model to analyze how doping affects charge dynamics in electron-doped cuprates, revealing pseudogap features, a crossover in resistivity behavior, and a link to magnetic correlations, aligning with experimental observations.

Contribution

It provides a theoretical analysis of charge dynamics in electron-doped cuprates within the t-t'-J model, highlighting doping-dependent behaviors and their relation to magnetic correlations.

Findings

Charge conductivity spectrum shows pseudogap structure.

Resistivity exhibits a crossover from metallic to insulating behavior.

Charge dynamics are related to magnetic correlations.

Abstract

Within the t-t'-J model, the doping dependence of charge dynamics in electron-doped cuprates is studied. The conductivity spectrum shows a pseudogap structure with a low-energy peak appearing at $\omega\sim 0$ and an rather sharp midinfrared peak appearing around $\omega\sim 0.3\mid t\mid$, and the resistivity exhibits a crossover from the high temperature metallic-like to low temperature insulating-like behavior in the relatively low doped regime, and a metallic-like behavior in the relatively high doped regime, in qualitative agreement with experiments. Our results also show that these unusual behaviors of the charge dynamics is intriguingly related to the magnetic correlation in the system.