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arXiv 2003.03895cond-mat.mtrl-sci
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MoTe $_{2}$中氢致相变的厚度依赖性

Thickness-dependence of hydrogen-induced phase transition in MoTe$_{2}$

Priyanka Manchanda, Pankaj Kumar, Pratibha Dev

摘要:

二维过渡金属二硫属化物(TMD)通常存在于具有不同物理性质的两个或更多个结构相中,并且可以通过不同的刺激在这些相之间重复切换,使得它们潜在地用于存储器件。了解TMD与传统半导体或形成异质或同质组件的其他2D晶体之间的界面物理是其在技术中成功应用的核心。然而,迄今为止,大多数的理论工作都是探讨孤立的TMD单分子膜在真空中的相变特性。使用\textit{ab-initio}计算,我们展示了界面效应如何修改的热力学和动力学的相变通过研究氢诱导的转变在单层和双层的MoTe $_{2}$。MoTe $_{2}$的相变特性显示出很大的厚度依赖性,在氢化的双层中的过渡的时间尺度是约$10^7$ -倍长于在室温下的单层。我们的研究强调了在预测二维晶体的性质时考虑直接环境影响的重要性。

英文摘要:

Two-dimensional transition metal dichalcogenides (TMDs) usually exist in two or more structural phases with different physical properties, and can be repeatedly switched between these phases via different stimuli, making them potentially useful for memory devices. An understanding of the physics of interfaces between the TMDs and conventional semiconductors, or other 2D-crystals forming heterogenous or homogeneous assemblies is central to their successful application in technologies. However, to date, most theoretical works have explored phase-change properties of isolated TMD monolayers in vacuum. Using \textit{ab-initio} calculations, we show how interfacial effects modify the thermodynamics and kinetics of the phase transition by studying hydrogen-induced transitions in monolayers and bilayers of MoTe$_{2}$. The phase-change properties of MoTe$_{2}$ show substantial thickness-dependence, with the timescale for a transition in the hydrogenated bilayer being about $10^7$-times longer than that in a monolayer at room temperature. Our study highlights the importance of taking effects of immediate environment into account when predicting properties of 2D crystals.

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