# Dynamical mean-field study of Vanadium diselenide monolayer ferromagnetism

## TL;DR

This study uses advanced computational methods to clarify the magnetic properties of monolayer VSe₂, confirming its ferromagnetism at room temperature and revealing its sensitivity to charge doping, thus resolving previous theoretical and experimental conflicts.

## Contribution

It introduces a combined density functional theory and dynamical mean-field theory approach to accurately model VSe₂'s magnetism, surpassing conventional methods and clarifying its two-dimensional ferromagnetic nature.

## Key findings

- Monolayer VSe₂ is ferromagnetic with a Curie temperature of 250K.
- The ferromagnetism is inherently two-dimensional.
- Charge doping destabilizes the ferromagnetic order.

## Abstract

To understand the magnetism of VSe$_2$, whose monolayer form has recently been reported to be a room temperature ferromagnet, Here, the combined method of conventional density functional theory with dynamical mean-field theory has been adopted. This higher-level computation method enables us to resolve many of existing controversies and contradictions in between theory and experiment. First of all, this new approach is shown to give the correct magnetic properties of both bulk and two-dimensional limit of VSe$_2$ which demonstrates its superiority to the conventional methods. The results demonstrate that monolayer VSe$_2$ without charge density waves is a ferromagnet with ordering temperature of 250K. From the direct simulation of temperature-dependent magnetic susceptibility and ordered moment, it is shown that its ferromagnetism is clearly two-dimensional in nature. Further, it is shown that this ferromagnetic order is vulnerable to extra charge dopings which provides the important insight to elucidate recent experimental controversies.