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arXiv 2602.16451cond-mat.mes-hallcond-mat.mtrl-sci
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在石墨烯/碳化硅界面实现大面积二维锡的约束外延

Confinement Epitaxy of Large-Area Two-Dimensional Sn at the Graphene/SiC Interface

Chemnitz University of Technology(开姆尼茨工业大学);Research Center for Materials, Architectures and Integration of Nanomembranes (MAIN)(纳米膜材料、架构与集成研究中心)

Zamin Mamiyev, Niclas Tilgner, Narmina O. Balayeva, Dietrich R. T. Zahn, Thomas Seyller, Christoph Tegenkamp

AI总结:

通过二维锡插层在石墨烯/碳化硅界面实现大面积准自由站立单层石墨烯,揭示扩散驱动机制并提供应变工程新自由度。

摘要:

在石墨烯下方进行约束外延可稳定异常材料相,通过限制垂直生长并改变横向扩散,这些条件在裸露基底上无法实现。然而,实现长程界面有序同时保持高质量石墨烯仍是一个重大挑战。本文展示了通过二维锡的插层合成大面积准自由站立单层石墨烯(QFMLG)。虽然三角锡(1x1)界面表现出稳健的金属带结构,但解耦的QFMLG保持电中性,通过光电发射光谱证实。利用高分辨率拉曼光谱和显微镜,我们区分了直接插层和扩散驱动扩展,确定后者是获得高质量QFMLG晶体质量的关键路径。温度依赖性分析揭示了解耦的QFMLG与锡界面之间的动态结构耦合,为应变工程提供了一种新的自由度。除了揭示扩散驱动机制外,这项工作确立了金属插层作为定制耐用石墨烯-金属异质结构的有效策略,为下一代量子材料平台提供可调性质的材料。

英文摘要:

Confinement epitaxy beneath graphene stabilizes exotic material phases by restricting vertical growth and altering lateral diffusion, conditions unattainable on bare substrates. However, achieving long-range interfacial order while maintaining high-quality graphene remains a significant challenge. Here, we demonstrate the synthesis of large-area quasi-free-standing monolayer graphene (QFMLG) via the intercalation of a two-dimensional (2D) Sn. While the triangular Sn(1x1) interface exhibits a robust metallic band structure, the decoupled QFMLG maintains charge neutrality, confirmed by photoemission spectroscopy. Using high-resolution Raman spectroscopy and microscopy, we distinguish between direct intercalation and diffusion-driven expansion, identifying the latter as the critical pathway to superior QFMLG crystalline quality. Temperature-dependent analysis reveals dynamical structural coupling between the decoupled QFMLG and the Sn interface, providing a novel degree of freedom for strain engineering. Beyond uncovering the diffusion-driven mechanism, this work establishes metal intercalation as an effective strategy for tailoring durable graphene-metal heterostructures with tunable properties for next-generation quantum materials platforms.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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