Charge transport of electron doped Mott insulators on a triangular lattice

TL;DR

This paper investigates charge transport in electron-doped Mott insulators on a triangular lattice using the t-J model, revealing a crossover in resistivity and spectral features linked to kinetic and magnetic energy competition.

Contribution

It introduces a theoretical analysis of charge transport in these systems using partial charge-spin separation, highlighting the role of energy competition in observed phenomena.

Findings

Resistivity shows a crossover from metallic to insulating behavior.

Spectral function exhibits a low-energy peak and midinfrared band.

Transport properties are influenced by kinetic and magnetic energy competition.

Abstract

The charge transport of electron doped Mott insulators on a triangular lattice is investigated within the t-J model based on the partial charge-spin separation fermion-spin theory. The conductivity spectrum shows a low-energy peak and the unusual midinfrared band, while the resistivity is characterized by a crossover from the high temperature metallic-like to the low temperature insulating-like behavior, in qualitative agreement with experiments. Our results also show that the mechanism that cause this unusual charge transport is closely related with a competition between the kinetic energy and magnetic energy in the system.