Strong many-body interactions in ultrathin anisotropic tin (II) monosulfide

Abstract

Two-dimensional (2D) tin(II) monosulfide (SnS) with strong structural anisotropy has been proven to be a phosphorene analogue. However, difficulty in isolating very thin layer of SnS pose challenges in practical utilization. Here, we prepare ultrathin SnS via liquid phase exfoliation. With transmission electron microscopy, we identify the buckled structure of 2D SnS. We employ temperature dependent Raman spectroscopy to elucidate electron-phonon interactions, which reveals a linear phonon shifts. The active Raman modes of ultrathin SnS exhibit higher sensitivity to temperature than other 2D materials. Moreover, we demonstrate strong light-matter interaction in ultrathin SnS using Z-scan and ultrafast spectroscopy. Rich exciton-exciton and coherent exciton-photon interactions arising from many-particle excited effects in ultrathin SnS eventually enhances the nonlinear optical properties. Our findings highlight the prospects for the synthesis of ultrathin anisotropic SnS towards the betterment of thermoelectric and photonic devices.

arXiv comment34 pages (Manuscript: 26 pages and Supplementary information: 8 pages), 10 figures including 4 figures in Supplementary information

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• Experimental formation of monolayer group-IV monochalcogenides
• Review of Nanolayered Post-transition Metal Monochalcogenides: Synthesis, Properties, and Applications
• Robust B-exciton emission at room temperature in few-layers of MoS2:Ag nanoheterojunctions embedded into a glass matrix
• In-plane anisotropic quantum confinement effect in ultrasmall SnS sheets
• Future prospect of anisotropic 2D tin sulfide (SnS) for emerging electronic and quantum device applications
• Advancements in Entangled Photon Pairs in 2D Van der Waals Materials for On-chip Quantum Applications