The observation of electrically tunable and highly confined plasmons in graphene has stimulated the exploration of interesting properties of plasmons in other two-dimensional materials. Recently, hyperbolic plasmon resonance modes have been observed in exfoliated ${\mathrm{W}\mathrm{Te}}_2$ films, a type-II Weyl semimetal with layered structure, providing a platform for the assembly of plasmons with hyperbolicity and exotic topological properties. However, the plasmon modes were observed in relatively thick and small-area films, which restrict the tunability and application for plasmons. Here, large-area (approximately cm) ${\mathrm{W}\mathrm{Te}}_2$ films with different thicknesses are grown by the chemical vapor deposition method, in which plasmon resonance modes are observed in films with different thicknesses down to about 8 nm. Hybridization of plasmon and surface polar phonons of the substrate is revealed by mapping the plasmon dispersion. The plasmon frequency is demonstrated to be tunable by changing the temperature and film thickness. Our results facilitate the development of a tunable and scalable ${\mathrm{W}\mathrm{Te}}_2$ plasmonic system for revealing topological properties and towards various applications in sensing, imaging, and light modulation.

中文翻译：

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大面积WTe2Thin薄膜中的可调等离子。

石墨烯中电可调谐和高度受限的等离激元的观察激发了对其他二维材料中等离激元有趣特性的探索。最近，在剥离中观察到了双曲等离子体共振模式${\mathrm{w\; ^}特}_2$薄膜，一种具有分层结构的II型Weyl半金属，为组装具有双曲性和奇异拓扑特性的等离激元提供了平台。但是，在相对厚和小面积的薄膜中观察到了等离子体激元模式，这限制了等离子体激元的可调性和应用。在这里，大面积（约厘米）${\mathrm{w\; ^}特}_2$通过化学气相沉积法生长具有不同厚度的膜，其中在低至约8nm的不同厚度的膜中观察到等离子体激元共振模式。通过绘制等离激元弥散图可以揭示底物的等离激元和表面极性声子的杂交。通过改变温度和膜厚证明等离激元频率是可调的。我们的结果有助于开发可调和可扩展的产品${\mathrm{w\; ^}特}_2$ 等离子体系统，用于揭示拓扑特性，并在传感，成像和光调制方面有多种应用。