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arXiv · 2512.05616

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

Kati Asikainen·Frédéric Chassot·Baptiste Hildebrand·Aymen Mahmoudi·Joel Morf·Mahault Berset·Pascal Turban·Matti Alatalo·S. Assa Aravindh·Marko Huttula·KeYuan Ma·Fabian O. von Rohr·Jean-Christophe Le Breton·Thomas Jaouen·Claude Monney
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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.

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Kati Asikainen, Frédéric Chassot, Baptiste Hildebrand, Aymen Mahmoudi, Joel Morf, Mahault Berset, Pascal Turban, Matti Alatalo, S. Assa Aravindh, Marko Huttula, KeYuan Ma, Fabian O. von Rohr, Jean-Christophe Le Breton, Thomas Jaouen, Claude Monney. 2025-12-05. Suppression of stripe-ordered structural phases in monolayer IrTe$_2$ by a gold substrate. https://arxiv.org/abs/2512.05616

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