Synthesis of epitaxial monolayer Janus SPtSe

Abstract

Janus single-layer transition metal dichalcogenides, in which the two chalcogen layers have a different chemical nature, push chemical composition control beyond what is usually achievable with van der Waals heterostructures. Here we report such a novel Janus compound, SPtSe, which is predicted to exhibit strong Rashba spin-orbit coupling. We synthetized it by conversion of a single-layer of PtSe${}_2$ on Pt(111) via sulphurization under H${}_2$S atmosphere. Our in situ and operando structural analysis with grazing incidence synchrotron X-ray diffraction reveals the process by which the Janus alloy forms. The crystalline long-range order of the as-grown PtSe${}_2$ monolayer is first lost due to thermal annealing. A subsequent recrystallization in presence of a source of sulphur yields a highly ordered SPtSe alloy, which is iso-structural to the pristine PtSe${}_2$. The chemical composition is resolved, layer-by-layer, using angle-resolved X-ray photoelectron spectroscopy, demonstrating that Se-by-S substitution occurs selectively in the topmost chalcogen layer.

arXiv comment23 pages, 4 figures and 1 table

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• High quality atomically thin PtSe2 films grown by molecular beam epitaxy
• Graphene on Ru(0001): A corrugated and chiral structure
• Van der Waals solid phase epitaxy to grow large-area manganese-doped MoSe${}_2$ few-layers on SiO${}_2$/Si

Cited by in corpus (16)

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• Strain Anisotropy Driven Spontaneous Formation of Nanoscrolls from Two-Dimensional Janus Layers
• High carrier mobility in single-crystal PtSe2 grown by molecular beam epitaxy on ZnO(0001)
• Superconductivity and strain-enhanced phase stability of Janus tungsten chalcogenide hydride monolayers
• Spin-orbit correlations and exchange-bias control in twisted Janus dichalcogenide multilayers
• Anisotropic Rashba splitting dominated by out-of-plane spin polarization in two-dimensional Janus $X{A}_{2}Y$ ($A$= Si, Sn, Ge; $X,Y$= Sb, Bi) with surface imperfection
• When Energy and Information Revolutions Meet 2D Janus
• Giant Valley-Polarized Spin Splittings in Magnetized Janus Pt Dichalcogenides
• Phase Stability and Superconductivity in Hydrogenated and Lithiated Janus GaXS2 (X = Ga, In) Monolayers
• Tuning magnetic exchange interactions in 2D magnets: the case of CrGeX${}_3$ (X = Se, Te) and Janus Cr${}_2$Ge${}_2$(Se,Te)${}_3$ monolayers
• Using in-plane anisotropy to engineer Janus monolayers of rhenium dichalcogenides
• Control of magnetic transition, metal-semiconductor transition, and magnetic anisotropy in noncentrosymmetric monolayer Cr${}_2$Ge${}_2$Se${}_3$Te${}_3$
• Robust Ferrimagnetic Ground State and Suppressed Superconductivity in Two-Dimensional HC6
• Theoretical prediction of Structural Stability and Superconductivity in Janus Ti2CSH MXene