Suppression of stripe-ordered structural phases in monolayer IrTe$_2$ by a gold substrate

TL;DR

This study demonstrates that gold-assisted exfoliation produces large-area monolayer IrTe₂ with electronic properties similar to freestanding layers, and shows that substrate interactions suppress stripe-ordered phases by hybridization effects.

Contribution

It reveals how gold substrate interactions stabilize the 1T phase of monolayer IrTe₂ and suppress stripe-ordered phases, advancing 2D material engineering.

Findings

Gold-assisted exfoliation yields large-area monolayer IrTe₂.

Substrate hybridization modulates electronic structure.

Stripe-ordered phases are suppressed by substrate effects.

Abstract

Metal-assisted exfoliation of two-dimensional (2D) materials has emerged as an efficient route to isolating large-area monolayer crystals, yet the influence of the supporting metal substrate on their intrinsic properties remains poorly understood. Here, we demonstrate successful gold-assisted exfoliation of monolayer IrTe$_2$ up to the millimeter scale. Angle-resolved photoemission spectroscopy (ARPES), combined with first-principles calculations, reveals that the low-energy electronic structure closely resembles that of a freestanding monolayer 1T-IrTe$_2$. We find that quasi-covalent hybridization together with substrate-induced strain leads to only modest modifications of the electronic bands. Although strain contributes to phase stability, it is essentially hybridization that drives the stabilization of the 1T-phase of the monolayer IrTe$_2$ by suppressing stripe-ordered phase transitions. These results establish gold-assisted exfoliation as a robust route to prepare a large-area monolayer IrTe$_2$ and highlight the role of metal-substrate interaction in engineering 2D materials with tailored structural phases.