Electron-hole asymmetry in magnetic properties of lightly doped high-$T_{\rm C}$ superconductors: a quantum Monte Carlo study

TL;DR

This study uses quantum Monte Carlo simulations to investigate the magnetic differences between electron- and hole-doped high-temperature superconductors near half-filling, revealing persistent antiferromagnetic order especially in electron-doped cases.

Contribution

It provides a detailed numerical analysis of electron-hole asymmetry in magnetic properties of cuprates using a variational quantum Monte Carlo approach on the 2D t-J model.

Findings

Antiferromagnetic order persists at low doping levels.

Electron-doped cuprates exhibit more robust antiferromagnetism.

The study confirms experimental observations of asymmetry.

Abstract

Using a recently developed variational quantum Monte Carlo method, magnetic properties of high-$T_{\rm C}$ superconductors are studied at zero temperature ($T$), by numerical simulations on the 2D t-J model. Our focus here is to explore the difference in the properties of $p$-type and $n$-type cuprates as a function of the carrier concentrations close to half filling. As observed experimentally, it is found that the antiferromagnetically ordered phase persists even for a small, yet finite amount of carrier doping, and that this phase is more robust in the electron doped case.