# Evidence for metallic 1T phase, 3d1 electronic configuration and charge density wave order in molecular-beam epitaxy grown monolayer VTe2

## TL;DR

This study combines experimental and theoretical methods to confirm the metallic 1T phase, 3d1 electronic configuration, and charge density wave order in monolayer VTe2 grown by molecular-beam epitaxy, challenging previous ferromagnetism predictions.

## Contribution

It provides direct experimental evidence and theoretical analysis of the electronic structure and charge density wave order in monolayer VTe2, clarifying its magnetic properties.

## Key findings

- Confirmed metallic 1T phase in monolayer VTe2
- Identified 3d1 electronic configuration
- Observed (4 x 4) charge density wave order

## Abstract

We present a combined experimental and theoretical study of monolayer VTe2 grown on highly oriented pyrolytic graphite by molecular-beam epitaxy. Using various in-situ microscopic and spectroscopic techniques, including scanning tunneling microscopy/spectroscopy, synchrotron X-ray and angle-resolved photoemission, and X-ray absorption, together with theoretical analysis by density functional theory calculations, we demonstrate direct evidence of the metallic 1T phase and 3d1 electronic configuration in monolayer VTe2 that also features a (4 x 4) charge density wave order at low temperatures. In contrast to previous theoretical predictions, our element-specific characterization by X-ray magnetic circular dichroism rules out a ferromagnetic order intrinsic to the monolayer. Our findings provide essential knowledge necessary for understanding this interesting yet less explored metallic monolayer in the emerging family of van der Waals magnets.

---
Source: https://tomesphere.com/paper/1907.06185