arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1910.08950cond-mat.mtrl-sci
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Nb2SiTe4和Nb2GeTe4中具有良好电子性质的二维铁弹半导体

Two-dimensional ferroelastic semiconductors in Nb2SiTe4 and Nb2GeTe4 with promising electronic properties

Ting Zhang, Yandong Ma, Xilong Xu, Chengan Lei, Baibiao Huang, Ying Dai

摘要:

具有铁弹性耦合和吸引人的电子特性的二维晶体为实现长期寻求的可控器件提供了前所未有的机会。但到目前为止,报告的建议主要是基于假设的结构。在这里,使用第一性原理计算,我们确定的单层Nb 2AT 4(A = Si,Ge),这可能是剥离从他们的层状块体,是有前途的候选人。单层Nb2ATe4被发现是动态的,热和化学稳定的。它们具有良好的铁弹性能,具有较高的可逆铁弹应变和适中的铁弹转变能垒,有利于实际应用。同时,它们具有优异的各向异性电子特性,包括各向异性载流子迁移率和光学特性。更重要的是,通过铁弹开关可以有效地控制单层Nb2Ate4的各向异性特性。这些吸引人的属性结合实验的可行性,使单层Nb2ATe4非凡的平台,实现可控设备。

英文摘要:

Two-dimensional crystals with coupling of ferroelasticity and attractive electronic properties offer unprecedent opportunities for achieving long-sought controllable devices. But so far, the reported proposals are mainly based on hypothetical structures. Here, using first-principles calculations, we identify single-layer Nb2ATe4 (A = Si, Ge), which could be exfoliated from their layered bulks, are promising candidates. Single-layer Nb2ATe4 are found to be dynamically, thermally and chemically stable. They possess excellent ferroelasticity with high reversible ferroelastic strain and moderate ferroelastic transition energy barrier, beneficial for practical applications. Meanwhile, they harbor outstanding anisotropic electronic properties, including anisotropic carrier mobility and optical properties. More importantly, the anisotropic properties of single-layer Nb2ATe4 can be efficiently controlled through ferroelastic switching. These appealing properties combined with the experimental feasibility render single-layer Nb2ATe4 extraordinary platforms for realizing controllable devices.

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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