Charge transport in underdoped bilayer cuprates

TL;DR

This study uses the t-J model to analyze charge transport in underdoped bilayer cuprates, revealing that bilayer interactions cause band splitting but do not alter the fundamental transport behavior observed in single-layer cuprates.

Contribution

It demonstrates that bilayer interactions lead to band splitting without changing the qualitative charge transport properties in underdoped cuprates.

Findings

Charge transport behavior similar to single-layer cuprates.

Presence of a low-energy peak and midinfrared band in conductivity spectrum.

Temperature-dependent suppression of the midinfrared band and crossover in resistivity.

Abstract

Within the t-J model, we study the charge transport in underdoped bilayer cuprates by considering the bilayer interaction. Although the bilayer interaction leads to the band splitting in the electronic structure, the qualitative behavior of the charge transport is the same as in the case of single layer cuprates. The conductivity spectrum shows a low-energy peak and the unusual midinfrared band. This midinfrared band is suppressed severely with increasing temperatures, while the resistivity in the heavily underdoped regime is characterized by a crossover from the high temperature metallic-like to the low temperature insulating-like behaviors, which are consistent with the experiments.