# Mechanism of High-Temperature Superconductivity in Correlated-Electron Systems

## TL;DR

This review discusses the mechanisms behind high-temperature superconductivity, emphasizing the role of strong electron correlations and large-energy scale interactions, with a focus on cuprate superconductors and variational Monte Carlo results.

## Contribution

It provides a comprehensive review of high-temperature superconductivity mechanisms, highlighting the importance of strong electron correlations in cuprates and presenting new Monte Carlo simulation insights.

## Key findings

- Superconductivity in cuprates is induced by strong on-site Coulomb interactions.
- High-temperature superconducting phase exists in strongly correlated electronic models.
- Strong electron correlation is key to understanding high-temperature superconductivity.

## Abstract

It is very important to elucidate the mechanism of superconductivity for achieving room temperature superconductivity. This paper is a short review article on the mechanism of high-temperature superconductivity. In the first half of this paper, we give a brief review on mechanisms of superconductivity in many-electron systems. We believe that high-temperature superconductivity may occur in a system with interaction of large-energy scale. Empirically, this is true for superconductors that have been found so far. In the second half of this paper, we discuss cuprate high-temperature superconductors. We argue that superconductivity of high temperature cuprates is induced by the strong on-site Coulomb interaction, that is, the origin of high-temperature superconductivity is the strong electron correlation. We show the results on the ground state of electronic models for high temperature cuprates on the basis of the optimization variational Monte Carlo method. A high-temperature superconducting phase will exist in the strongly correlated region.