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Updated: Jul 1, 2025

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在WSe_2-Te单层中由电荷注入和压力驱动的相位过渡:一项第一原则研究

Liyuan Chen¹, Li Chen¹, Hongli Chen¹

¹Technical Center for Multifunctional Magneto-Optical Spectroscopy (Shanghai), Engineering Research Center of Nanophotonics & Advanced Instrument (Ministry of Education), Department of Physics, School of Physics and Electronic Science, East China Normal University, Shanghai 200241, China. zghu@ee.ecnu.edu.cn.

|March 13, 2024

概括

通过将二化 (WSe2) 与 (Te) 合金,可以在二维材料中实现受控的相位过渡. 这项研究揭示了Te的丰富和电荷注入如何降低结构变化的能量屏障,这对于新型电子设备至关重要.

科学领域:

材料科学材料科学材料科学
凝聚物质物理学凝聚物质物理学
纳米技术纳米技术

背景情况:

合金过渡金属二甲基化物 (TMDs) 为电子应用提供可调节的特性.
了解合金TMD中的结构稳定性和相位过渡机制,特别是在外部领域,仍然是一个挑战.

研究的目的:

为了研究WSe2-xTex单层中的结构相位过渡机制.
探索丰富和外部场 (电荷注入,拉伸应变) 对相位稳定性和过渡障碍的影响.

主要方法:

使用第一原则计算来研究WSe2-xTex单层.
结晶轨道哈密尔顿人群 (COHP) 分析被用来探测结合状态和结构稳定性.
系统地研究了不同含量,电子度和拉伸应变的影响.

主要成果:

在WSe2-xTex单层中的丰富推动了从H相到T'相的连贯结构过渡.
增加的度会使H相不稳定,将结合状态转移到Fermi水平附近,降低过渡能量屏障.
电荷注入可以触发H-to-T'相位过渡,随着含量增加,关键电子度下降.
拉力应变有效地降低了H-T'阶段过渡的能量屏障.

结论:

将WSe2与Te合金为控制结构稳定性和半导体-半金属相位过渡提供了一条途径.
电荷注入和拉伸应变提供外部刺激来调整相位过渡,为新型相位变换电子设备铺平道路.
这项研究为使用合金TMD的相位敏感装置的设计提供了关键的见解.

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